Tweak kill-app delay

*750 just feel a little too long imo. Adjust the delay
 slightly to make it feel a little more appropriate.

Change-Id: I900c0030150d456b4cc43e2349dcffbc13e5145f
Signed-off-by: Jonathan Steadman <xxwhitehawk@gmail.com>
Merge "Tweak kill-app delay" into kitkat