[fix][ui] Set speed factor combo box according to animation play mode

Changing speed factor using combo box may lead to animation play mode change.
However, if user changes manually the animation play mode, it may be contradictory with the information displayed by the combo box.

lqPlayerControlsToolbar now listens to animation play mode changes, and adapt the combo box display accordingly.

Furthermore, when a new animations scene is set, lqPlayerControlsToolbar set its PlayMode accordingly with UI speed combo box.