Fixes 2 sync and UI bugs in music-together plugin #4071
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Fix 1:
When guest plays a playlist, it would just append to the hosts playlist. Added the CLEAR_QUEUE event to sync the playlist clears.
Problem 2:
When the guest plays its playlist, due to CLEAR_QUEUE, the hosts player index is set to -1, so when the guests items are added, nothing plays and the UI gets locked in a not playing state, hence just setting the player index to the start item fixes this (via the SET_INDEX event)