[UI] Default supplier fix

[SchrodingersGat]

• Fix selection of default supplier in part form
• Fix display of default supplier in part detail page
• Ref: Default Supplier Support Missing in 1.X.X #10979 (comment)

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.16%. Comparing base (8715151) to head (d854f82).
⚠️ Report is 298 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #11142      +/-   ##
==========================================
- Coverage   88.17%   88.16%   -0.01%     
==========================================
  Files        1290     1290              
  Lines       58183    58182       -1     
  Branches     1969     1969              
==========================================
- Hits        51300    51299       -1     
  Misses       6392     6392              
  Partials      491      491              

Components	Coverage Δ
Backend Apps	92.01% <ø> (ø)
Backend General	93.51% <ø> (ø)
Frontend	70.84% <ø> (-0.01%)	⬇️

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