When manual mode is true `_animationPlaying` is never set to false

[shedokan]

Description

_animationPlaying is never set to false on animation end if manual mode is on.

Expected outcome

It should be set to false once an animation ends.

Actual outcome

It stays as true, and instead of showing the exit animation after the entry one it cancells it.

Steps to reproduce

1. Put a paper-tooltip element in the page with manual-mode="true".
2. Have a button that calls playAnimation('entry')
3. After the animation is finished check the _animationPlaying value