fix(ui): allowedAttachmentPickerTypes not working on mobile devices.

[xsahil03x]

Fixes: #1721

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (7625257) 58.28% compared to head (b2a78a4) 58.28%.

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Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1727   +/-   ##
========================================
  Coverage    58.28%   58.28%           
========================================
  Files          292      292           
  Lines        18005    18005           
========================================
  Hits         10495    10495           
  Misses        7510     7510           

Files Changed	Coverage Δ
...ut/attachment_picker/stream_attachment_picker.dart	0.00% <0.00%> (ø)

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