Fix sticky firstEventAfterDiscontinuity setting

This value needs to be explicitly set to false to prevent re-using a
stale "true" value.

Fixes: 245965753
Test: CTS SensorHeadTrackerTest#testDiscontinuity (pending upload)
Change-Id: Icd018e0cab9e30b0677970760a38a390d9dd2a3c
1 file changed