DatePicker: default OpenTo to Year when both FixDay and FixMonth are provided

[ZephyrZiggurat]

Description

Flipped the order of setting the default OpenTo in MudBaseDatePicker.OnPickerOpened. FixDay by itself was checked first and so combining FixDay and FixMonth was no longer considered.

This only occurs when the user does not explicitly set OpenTo when using the date picker.

How Has This Been Tested?

added Open_FixMonth_FixDay_CheckOpenTo and Open_FixDay_CheckOpenTo

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)

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 90.48%. Comparing base (28bc599) to head (235e63b).
Report is 194 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #8932      +/-   ##
==========================================
+ Coverage   89.82%   90.48%   +0.65%     
==========================================
  Files         412      419       +7     
  Lines       11878    12211     +333     
  Branches     2364     2385      +21     
==========================================
+ Hits        10670    11049     +379     
+ Misses        681      627      -54     
- Partials      527      535       +8     

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[ScarletKuro]

Hi.

Thanks for the PR.
Please add a bUnit test for the scenario that you fixed.

[ZephyrZiggurat]

Tests added!

[henon]

Thanks