Update manifest to reflect changes to fishjam-react-native-webrtc

[Magmusacy]

Description

Updated manifest to reflect changes made to fishjam-react-native-webrtc

Motivation and Context

I've made changes to fishjam-react-native-webrtc that makes mediaProjectionService in manifest obsolete

Documentation impact

• Documentation update required
• Documentation updated in another PR
• No documentation update required

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to
  not work as expected)

[linear]

FCE-2644

[Copilot]

Pull request overview

This PR updates the Expo config plugin’s Android manifest service configuration to align with changes in fishjam-react-native-webrtc, and cleans up an example screen import to match the project’s React JSX runtime settings.

Changes:

• Update WebRTCForegroundService manifest entry to include mediaProjection in android:foregroundServiceType when screensharing is enabled, and remove the separate MediaProjectionService manifest entry.
• Remove the unused default React import from an example tsx screen (the project uses jsx: react-jsx).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
packages/mobile-client/plugin/src/withFishjamAndroid.ts	Adjusts generated AndroidManifest service configuration to reflect the updated WebRTC foreground service/screensharing behavior.
examples/mobile-client/fishjam-chat/app/room/[roomName].tsx	Removes unused React default import under the automatic JSX runtime.

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