Fix Clear Button Show on ReadOnly Components

[mckaragoz]

Fix #617

[codecov]

Codecov Report

❌ Patch coverage is 72.72727% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 68.06%. Comparing base (6a7efdc) to head (6fe94ea).
⚠️ Report is 2 commits behind head on dev.

Files with missing lines	Patch %	Lines
...ts/TextFieldExtended/MudTextFieldExtended.razor.cs	33.33%	1 Missing and 1 partial ⚠️
...Components/InputExtended/MudInputExtended.razor.cs	66.66%	0 Missing and 1 partial ⚠️

❌ Your patch status has failed because the patch coverage (72.72%) 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     #620   +/-   ##
=======================================
  Coverage   68.06%   68.06%           
=======================================
  Files         107      107           
  Lines        7508     7516    +8     
  Branches     1293     1297    +4     
=======================================
+ Hits         5110     5116    +6     
- Misses       1918     1919    +1     
- Partials      480      481    +1     

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