VLCKit: player's state change is delivered before position and currentProgress are updated

To reproduce:

Change the position of the player to the end. Observe these logs:

(lldb) po vlcState
VLCMediaPlayerStateEnded

(lldb) po duration
125.952

(lldb) po currentProgress
6.0999999999999996

(lldb) po position
0.048428963869810104

This also creates problems in other cases, but this is very clear.

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