MudToggleGroup: Fix icon margins

[danielchalmers]

Description

The checkmark icon didn't have enough padding on the side and touched the borders of the element.

How Has This Been Tested?

visually

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)

Before

After

Nothing changed if you don't have the icon enabled

Checklist

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

[danielchalmers]

Migration Guide:

ToggleItem: The span containing the checkmark icon was removed and the icon is now a direct child of mud-button-label. Checkmark classes that were on the span have been moved to the icon as well.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.22%. Comparing base (2b54ce6) to head (4810506).
Report is 12 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev   #10162      +/-   ##
==========================================
- Coverage   91.24%   91.22%   -0.02%     
==========================================
  Files         411      411              
  Lines       12492    12492              
  Branches     2434     2434              
==========================================
- Hits        11398    11396       -2     
  Misses        552      552              
- Partials      542      544       +2     

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[henon]

Thanks @danielchalmers !

[henon]

Added to v8.0.0 Migration Guide