Fix/datetimepicker dateonly default

[w3ori]

Fix

• MudDateTimePicker DateOnly opens at year 1 #637

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 65.37%. Comparing base (6051e0e) to head (414ab17).

Additional details and impacted files

@@ Coverage Diff @@## dev #644 +/- ##
==========================================
- Coverage 65.38% 65.37% -0.02% 
==========================================
Files 111 111 Lines 8381 8381 Branches 1480 1483 +3 ==========================================
- Hits 5480 5479 -1 
Misses 2394 2394 - Partials 507 508 +1 

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[w3ori]

@mckaragoz Can you look at this please?