Fix flickers in numeric pad of time picker
Fix flickers in numeric pad of time picker

Bug: 7407383
Switched all digits to Roboto Thin so there is no need to adjust
paddings.

Change-Id: Ide6cf79754645eb8f8b07719bea7105ab0ae7885

dseuss/deskclock,OrBin/SynClock-Android,dseuss/deskclock