Remove `audioSharingQsDialogImprovement` flag guard when injecting AudioSharingRepository.

`AudioSharingRepositoryImpl` contains general audio sharing functions (e.g, `audioSharingAvailable`), it should be injected whenever `enableLeAudioSharing` flag is on.

The dialog improvement behavior is guarded in the `AudioSharingDeviceItemActionInteractorImpl`.

Test: atest
Bug: 360759048
Flag: com.android.settingslib.flags.audio_sharing_qs_dialog_improvement
Change-Id: I12f0644e280473194822ff5cf30ed3ed99308494