fmbtgti: screenshotPixelSize found area correction

When using pixel sizes > 1, adjust found area to be in the middle
of detected area - instead of top-left corner.
fmbtandroid: topWindow returns last mCurrentFocus

In some rare cases there are more than one mCurrentFocus windows
in "dumpsys window" output. topWindow returns the last one instead
of the first one (previous default).
Merge remote-tracking branch '01/devel'