Moved assistant gesture to corners

The corners will be separated with quick switch by detecting at the slop
of the angle from touch down to that position. If over 30 deg then
assistant will be tracked otherwise quick switch while swipe up will not
be tracked at all.

Test: manual
Bug: 112934365
Change-Id: I6a3aeb1509d9706696a30ef1fba3ce7e3e5ec07c