Fix language switcher failing to set a default "type" value

[nicofrand]

According to the documentation https://docs.boltcms.io/5.0/twig-components/languageselect the language switcher should be usable without type:

{% include 'helpers/_languageselect.html.twig' %}

However, not setting the type like below will throw an error:

Twig\Error\RuntimeError:
Variable "type" does not exist.

  at vendor/bolt/core/templates/helpers/_languageselect.html.twig:22
  at __TwigTemplate_2281140af09e6102e86e7eafa527bafd11b91df66b58316afb745dd4e298e615->{closure}()
     (var/cache/dev/twig/58/58f807167b332d30faaf3f3777118f147f078e150977e0ac1d19f218da238901.php:57)
  at __TwigTemplate_2281140af09e6102e86e7eafa527bafd11b91df66b58316afb745dd4e298e615->doDisplay()
     (vendor/twig/twig/src/Template.php:394)
  at Twig\Template->displayWithErrorHandling()
     (vendor/twig/twig/src/Template.php:367)
  at Twig\Template->display()
     (var/cache/dev/twig/76/76263a4899b607054c1ebab37cf0df25d321cbe7d8454b62618cfa4dc60f9bea.php:59)
  at __TwigTemplate_9c77d5d01dfc5069d0e8a8163a940d579b40fac679cd19e28eb85116b3803fc4->doDisplay()
     (vendor/twig/twig/src/Template.php:394)
  at Twig\Template->displayWithErrorHandling()
     (vendor/twig/twig/src/Template.php:367)
  at Twig\Template->display()
     (vendor/twig/twig/src/Template.php:379)
  at Twig\Template->render()
     (vendor/twig/twig/src/TemplateWrapper.php:40)
  at Twig\TemplateWrapper->render()
     (vendor/twig/twig/src/Extension/CoreExtension.php:1347)
  at twig_include()
     (var/cache/dev/twig/3e/3e59e8963c4e0446a75941277df1d2c648227756b652d1addfe7cd55b505c39f.php:83)
  at __TwigTemplate_b180803ae46d1e67d24682057fc081a4292738d4544049c2a96ae9c3af589735->doDisplay()
     (vendor/twig/twig/src/Template.php:394)
  at Twig\Template->displayWithErrorHandling()
     (vendor/twig/twig/src/Template.php:367)
  at Twig\Template->display()
     (var/cache/dev/twig/e2/e23a21ca2ea7286990f1a4f2779899976336ce425b0105f0231edf72d9fcee84.php:48)
  at __TwigTemplate_df5b8db26974698fca99c605d6d80c345786e5b4bdd0db6acac991406e9a1905->doDisplay()
     (vendor/twig/twig/src/Template.php:394)
  at Twig\Template->displayWithErrorHandling()
     (vendor/twig/twig/src/Template.php:367)
  at Twig\Template->display()
     (vendor/twig/twig/src/Template.php:379)
  at Twig\Template->render()
     (vendor/twig/twig/src/TemplateWrapper.php:40)
  at Twig\TemplateWrapper->render()
     (vendor/twig/twig/src/Environment.php:280)
  at Twig\Environment->render()
     (vendor/bolt/core/src/Controller/TwigAwareController.php:231)
  at Bolt\Controller\TwigAwareController->renderTemplate()
     (vendor/bolt/core/src/Controller/TwigAwareController.php:90)
  at Bolt\Controller\TwigAwareController->render()
     (vendor/bolt/core/src/Controller/TwigAwareController.php:140)
  at Bolt\Controller\TwigAwareController->renderSingle()
     (vendor/bolt/core/src/Controller/Frontend/DetailController.php:64)
  at Bolt\Controller\Frontend\DetailController->record()
     (vendor/symfony/http-kernel/HttpKernel.php:163)
  at Symfony\Component\HttpKernel\HttpKernel->handleRaw()
     (vendor/symfony/http-kernel/HttpKernel.php:75)
  at Symfony\Component\HttpKernel\HttpKernel->handle()
     (vendor/symfony/framework-bundle/Controller/AbstractController.php:156)
  at Symfony\Bundle\FrameworkBundle\Controller\AbstractController->forward()
     (src/Controller/BrowserController.php:32)
  at App\Controller\BrowserController->redirectToUpdatePage()
     (vendor/symfony/http-kernel/HttpKernel.php:163)
  at Symfony\Component\HttpKernel\HttpKernel->handleRaw()
     (vendor/symfony/http-kernel/HttpKernel.php:75)
  at Symfony\Component\HttpKernel\HttpKernel->handle()
     (vendor/symfony/http-kernel/Kernel.php:202)
  at Symfony\Component\HttpKernel\Kernel->handle()
     (public/index.php:37)     

Only this form works:

{% include 'helpers/_languageselect.html.twig' with {'type': 'select'} %}

This is due to the helper template not using type|default('list') at each call and only setting the value to 'select' if type|default('list') is different from 'list'.
So, if no value if provided for type, the condition never applies as the default value ('list') is not different from 'list' and type remains undefined elsewhere in the template.

[bobdenotter]

Thanks, @nicofrand 👍