MudDataGrid: Fix regression in #9916 and #9801

[ScarletKuro]

Description

Fixes: #10041 Regression introduced in #9916
Fixes: #10034 Regression introduced in #9801

How Has This Been Tested?

Unit tests

Type of Changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation (fix or improvement to the website or code docs)

Checklist

• The PR is submitted to the correct branch (dev).
• My code follows the code style of this project.
• I've added relevant tests.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.05%. Comparing base (e49460d) to head (c8376ca).
Report is 1 commits behind head on dev.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev   #10042   +/-   ##
=======================================
  Coverage   91.05%   91.05%           
=======================================
  Files         410      410           
  Lines       12451    12457    +6     
  Branches     2427     2428    +1     
=======================================
+ Hits        11337    11343    +6     
  Misses        566      566           
  Partials      548      548           

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[0xced]

Thanks for fixing the regression I introduced in #9801, @ScarletKuro!