[stable30] fix submit button on file picker dialog

[luka-nextcloud]

Manual backport of #7180

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 53.68%. Comparing base (1dfee0a) to head (d3d2e40).
Report is 5 commits behind head on stable30.

Additional details and impacted files

@@            Coverage Diff            @@
##           stable30    #7198   +/-   ##
=========================================
  Coverage     53.68%   53.68%           
=========================================
  Files           116      116           
  Lines          2578     2578           
  Branches        525      527    +2     
=========================================
  Hits           1384     1384           
  Misses         1066     1066           
  Partials        128      128           

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