[Guided Tours] Fix blank screen after a session time out on the steps page

[obuisard]

Summary of Changes

This PR adds the missing getRedirectToListAppend function in the Step Controller that adds the missing tour_id query in the steps URL after returning from step edition.

Testing Instructions

Go to the Global Configuration, 'System' tab.
Set the session lifetime to 2mn.

Go to System -> Manage -> Guided Tours and go to the list of steps for a tour.
The URL in the browser address bar will be something like:
administrator/index.php?option=com_guidedtours&view=steps&tour_id=X

Edit a step. Cancel the edition (Select 'close').
The URL is now:
administrator/index.php?option=com_guidedtours&view=steps

Let the session run out.
Log back in.

Actual result BEFORE applying this Pull Request

When the user logs back in, the page is blank.

Expected result AFTER applying this Pull Request

When the user logs back in, the list of steps is available.
The URL when returning from step edition is:
administrator/index.php?option=com_guidedtours&view=steps&tour_id=X
(the tour_id query is always present).

Link to documentations

Please select:

• Documentation link for docs.joomla.org:

• No documentation changes for docs.joomla.org needed

• Pull Request link for manual.joomla.org:

• No documentation changes for manual.joomla.org needed

[ghost]

I have tested this item ✅ successfully on 9e0522c

Comment: Like to test your Pull Requests; easy understandable Instructions.

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[viocassel]

I have tested this item ✅ successfully on 9e0522c

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/44375.}

[Quy]

RTC

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/44375.}

[Hackwar]

Thank you for your contribution!