Fix horizontal scrollbar not showing in group view

[droidmonkey]

• Fixes Horizontal scrollbar not visible in groups #11300

Screenshots

Testing strategy

Tested manually

Type of change

• ✅ Bug fix (non-breaking change that fixes an issue)

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 63.00%. Comparing base (c1a66a8) to head (1519717).
Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/gui/group/GroupView.cpp	66.67%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #11303      +/-   ##
===========================================
+ Coverage    62.97%   63.00%   +0.03%     
===========================================
  Files          362      362              
  Lines        37783    37786       +3     
===========================================
+ Hits         23792    23804      +12     
+ Misses       13991    13982       -9     

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