Move clear recents button to bottom right

A lot of users were asking this button be moved to bottom right versus top right
for easier use with one hand so here it is. Finally got this figured out with the
help of mattmanwrx so credit him too. We had to edit those values in dimens.xml
also or else there was some ugly black line through the recent app thumbnail due
to the android margins we had to use. Nothing else seems affected by that anyways