MudAutocomplete: Fix missing margin-top when label is set

[ralvarezing]

Description

"Cascade" the Label parameter (in the MudAutocomplete) to the MudInput, so it is able to add (or not) the margin-top when the Label is defined.

related #8540

How Has This Been Tested?

Types 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)

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 89.84%. Comparing base (28bc599) to head (d62a2f0).
Report is 13 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #8623      +/-   ##
==========================================
+ Coverage   89.82%   89.84%   +0.01%     
==========================================
  Files         412      414       +2     
  Lines       11878    11911      +33     
  Branches     2364     2364              
==========================================
+ Hits        10670    10702      +32     
+ Misses        681      678       -3     
- Partials      527      531       +4     

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[danielchalmers]

Awesome