Increased the ratio of the bottom coordinate to the screen for doing quick switch gesture in tests.

The original ratio is not lower enough on the bottom of screen to trigger quick swich gesture in
some device types.

Test: http://ab/I02200010095374847
Bug: 244261956
Bug: 250459417

Change-Id: Ib867648d9a1265b029e2b03fb1ce12bd8677085c