[PUI] Fix user detail save on PUI

[matmair]

This PR fixes editing first and last name of a user (by themself). For this, a small API change is needed.

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[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 83.49%. Comparing base (7178b95) to head (fbf3edf).
Report is 328 commits behind head on master.

Files with missing lines	Patch %	Lines
...ex/Settings/AccountSettings/AccountDetailPanel.tsx	0.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #7906   +/-   ##
=======================================
  Coverage   83.48%   83.49%           
=======================================
  Files        1131     1131           
  Lines       50359    50361    +2     
  Branches     1740     1740           
=======================================
+ Hits        42042    42048    +6     
+ Misses       7869     7868    -1     
+ Partials      448      445    -3     

Flag	Coverage Δ
backend	85.20% <100.00%> (-0.01%)	⬇️
pui	65.29% <0.00%> (+0.06%)	⬆️

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