Fixed miss called property in getStoreIdByCode method

[maxalmonte14]

Description (*)

This PR solves the problem addressed in #134

Fixed Issues (if relevant)

1. Clean up Model/Import/Product/Type/Bundle.php #134: Clean up Model/Import/Product/Type/Bundle.php

Manual testing scenarios (*)

1. Run ./vendor/bin/phpstan analyse app/code/Magento/BundleImportExport/Model/Import/Product/Type/Bundle.php as described in Clean up Model/Import/Product/Type/Bundle.php #134, after this implementation the following error shouldn't be present

------ ------------------------------------------------------------------------------------------------------------------------------------------
  Line   Bundle.php
 ------ ------------------------------------------------------------------------------------------------------------------------------------------
  782    Access to an undefined property Magento\BundleImportExport\Model\Import\Product\Type\Bundle::$storeIdToCode.
 ------ ------------------------------------------------------------------------------------------------------------------------------------------

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds on Travis CI are green)

[dmanners]

Hello, thank you for your pull request. I will start to process this PR and get back to you if I need any more information.

[magento-engcom-team]

@maxalmonte14 thank you for contributing. Please accept Community Contributors team invitation here to gain extended permissions for this repository.

[dmanners]

Hi @maxalmonte14 I push 1 commit to this branch (b552406) to fix some php code style issues.

[maxalmonte14]

@dmanners excellent 👌