Fix order of mute adjustment in VGS sync with VSS

If setting the index before the mute this can lead to reapplying a stale
mute value that was not updated on the initial stream state

Test: adb shell device_config put media_audio com.android.media.audio.vgs_vss_sync_mute_order true
Test: https://android-build.corp.google.com/test_investigate/?invocationId=I82200010260265841&testResultId=TR11329232125910570
Bug: 331849188
Change-Id: If8940f123c9a94860fb3b154bcfd123fdebf0ba0