Fix widget drop animation in 4x5 grid

For the 4x5 grid we add insets to the widget and the
 animation wasn't accounting for it.

I'm using this shell function to quickly change the
animation speed

```
function anim-speed() {
	adb shell settings put global window_animation_scale $1
	adb shell settings put global transition_animation_scale $1
	adb shell settings put global animator_duration_scale $1
}
```

anim-speed 1 # for regular speed
anim-speed 10 # for really slow speed

Fix: 194227752
Test: Put down a widget in 4x5 and the animation should match,
sometimes is to fast but you can slow the animations with adb and see
the difference

Change-Id: I182729de39c0d0b12231d07e337dddca6fccf5c0