player: timer: fix paused state overridden

Player timer states are not really states but events. It is possible to receive a discontinuity while paused, in that case, the paused state was overridden causing UI timers to continue while paused. Store each events in different variables to fix this issue. Keeping the discontinuity event in the internal player state is useless since 1ecb283c.

Fixes #28622 (closed)