fix: iOSで画像保存時にパーミッション許可が表示されないのを修正

[4ster1sk]

Fix: #711

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 27.59%. Comparing base (cb8696b) to head (117b0ea).
Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
.../state_notifier/common/download_file_notifier.dart	0.00%	2 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #713      +/-   ##
===========================================
- Coverage    27.59%   27.59%   -0.01%     
===========================================
  Files          312      312              
  Lines        16454    16456       +2     
===========================================
  Hits          4541     4541              
- Misses       11913    11915       +2     

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