fix: 2 bugfixes (brand not removable + minor issue)

[g123k]

Hi everyone!

This PR fixes two issues:

• With the list of brands, it was impossible to delete a reordered brand
• The popup "Quit without saving?" ensures the current textfield is unfocused

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 6.23%. Comparing base (4d9c7fc) to head (bb8b7d5).
Report is 654 commits behind head on develop.

Files with missing lines	Patch %	Lines
...th_app/lib/pages/product/may_exit_page_helper.dart	0.00%	1 Missing ⚠️
...p/lib/pages/product/simple_input_page_helpers.dart	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           develop   #6199      +/-   ##
==========================================
- Coverage     9.54%   6.23%   -3.32%     
==========================================
  Files          325     456     +131     
  Lines        16411   26578   +10167     
==========================================
+ Hits          1567    1656      +89     
- Misses       14844   24922   +10078     

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