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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