[fix] Allow own user change

[triklozoid]

No description provided.

[codecov]

Codecov Report

Merging #1625 (79553b5) into master (e2eba82) will increase coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1625      +/-   ##
==========================================
+ Coverage   75.71%   75.74%   +0.03%     
==========================================
  Files         126      126              
  Lines        9062     9062              
==========================================
+ Hits         6861     6864       +3     
+ Misses       2201     2198       -3     

Impacted Files	Coverage Δ
label_studio/users/api.py	84.14% <ø> (ø)
label_studio/core/utils/common.py	82.25% <0.00%> (+0.84%)	⬆️

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