fix: requestPort bug & end call exception

[tadaspetra]

Release Version: 1.2.1

Release Notes

• requestPort bug not longer triggered when joining video call from a different screen
• post call exception not triggered by UI still building.

Pull request checklist

Please check if your PR fulfills the following requirements:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)
• The GitHub Actions pass building and linting. Linter returns no warnings or errors.
• The QA checklist below has been completed

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

What is the current behavior?

Exceptions when joining from a separate screen, and leaving back to previous screen

Issue Number: N/A

What is the new behavior?

No exceptions. The UI doesn't get build when it's joining, or leaving

Does this introduce a breaking change?

• Yes
• No

QA Checklist

VideoUIKit Update Checklist (Minor or Patch Release)

• Using the latest version of Agora's Video SDK
• Example apps are all functional
• Core features are still working (both ways across platforms)
  • Camera + Mic muting works for local and remote users
  • Users are added and removed correctly when they join and leave the channel
  • Older versions of the library gracefully handle changes (Create issue if not)
  • Builtin buttons all work as expected
• Any newly deprecated methods are flagged as such inline and in documentation

VideoUIKit Update Checklist (Major Release)

• The above checklist is completed (except backwards compatibility)
• Thoroughly tested for crashes, across multiple platforms at the same time

QA Notes

Other information