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. Had to edit thosevalues 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 seemed to be affected by those changes anyways