Fix grid size not working

[Gold872]

Resolves #73

[codecov]

Codecov Report

Attention: Patch coverage is 73.07692% with 7 lines in your changes missing coverage. Please review.

Project coverage is 62.77%. Comparing base (1f70675) to head (a28a5e9).

Files	Patch %	Lines
...able_containers/models/widget_container_model.dart	0.00%	6 Missing ⚠️
lib/widgets/tab_grid.dart	92.85%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #75      +/-   ##
==========================================
+ Coverage   62.69%   62.77%   +0.07%     
==========================================
  Files          75       75              
  Lines        7809     7811       +2     
==========================================
+ Hits         4896     4903       +7     
+ Misses       2913     2908       -5     

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