Correct size of AppWidget for color extraction.

Correct the size of the App Widget: first, compute the size when the
widget is positioned (it wasn't done), then do not apply the
transformation when computing the size of the widget when drawn.

Note: Somehow, there is a shift by 1 on the position on the x axis, both
in landscape and portrait. So I added a +1 to get the exact same values.
If not, we have a risk of getting different colors.

Fix: 188759989
Bug: 187907544
Test: Added logs and moved a widget by hand, check the actual
coordinates with hsv.

Change-Id: Ia3bd5b3e3ea9a3ef75f8cdf466a9800786646a94