Fix CodeInput Doesn't Work Properly When Pressed Backspace on Empty Component

[mckaragoz]

Fix partially #613

[codecov]

Codecov Report

❌ Patch coverage is 0% with 20 lines in your changes missing coverage. Please review.
✅ Project coverage is 67.97%. Comparing base (6a7efdc) to head (1edd1ed).
⚠️ Report is 3 commits behind head on dev.

Files with missing lines	Patch %	Lines
...ensions/Components/CodeInput/MudCodeInput.razor.cs	0.00%	20 Missing ⚠️

❌ Your patch status has failed because the patch coverage (0.00%) is below the target coverage (90.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #621      +/-   ##
==========================================
- Coverage   68.06%   67.97%   -0.09%     
==========================================
  Files         107      107              
  Lines        7508     7520      +12     
  Branches     1293     1295       +2     
==========================================
+ Hits         5110     5112       +2     
- Misses       1918     1929      +11     
+ Partials      480      479       -1     

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