Resolve unhandled exception on iOS

[mvanbeusekom]

Resolves the Unhandled Exception: type 'int' is not a subtype of type 'FutureOr' that occurred when calling the shouldShowRequestPermissionRationale on iOS.

Pre-launch Checklist

• I made sure the project builds.
• I read the Contributor Guide and followed the process outlined there for submitting PRs.
• I updated pubspec.yaml with an appropriate new version according to the pub versioning philosophy, or this PR is does not need version changes.
• I updated CHANGELOG.md to add a description of the change.
• I updated/added relevant documentation (doc comments with ///).
• I rebased onto main.
• I added new tests to check the change I am making, or this PR does not need tests.
• I made sure all existing and new tests are passing.
• I ran dart format . and committed any changes.
• I ran flutter analyze and fixed any errors.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.54%. Comparing base (412f25c) to head (2912a97).
Report is 6 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1298       +/-   ##
===========================================
+ Coverage   71.42%   93.54%   +22.11%     
===========================================
  Files           1        6        +5     
  Lines          35       93       +58     
===========================================
+ Hits           25       87       +62     
+ Misses         10        6        -4     

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[TimHoogstrate]

LGTM