Fix SpringAnimation in Behavior when current value is set.
Fix SpringAnimation in Behavior when current value is set.

Fixes regression introduced by d489f2f6549a86b3949004d1c8ec68487fc2adb7.
We now only avoid running the animation if the Behavior wasn't already
mid-animation. This ensure correct behavior for SpringAnimation, and
also correct state for 'running'.

Task-number: QTBUG-21549
Change-Id: I0f97813294cca22fb7a273e222fa0549c6de9ca7
Reviewed-by: Alan Alpert (Personal) <88b56286e35a5224392cc092099688d403c4217b@gmail.com>

matthewvogt/qtdeclarative,matthewvogt/qtdeclarative,matthewvogt/qtdeclarative,matthewvogt/qtdeclarative,matthewvogt/qtdeclarative,matthewvogt/qtdeclarative,matthewvogt/qtdeclarative,matthewvogt/qtdeclarative