Fix AccessibilityGestureDetectorTest

We increased the multi-finger stroke with the finger counts
multiplying the touch slop, it might exceed the maximum stroke
length, the half of screen width or height.

To fix it, we adjust the stroke length to the greater of the
default strok length and the multi-finger swipe stroke threshold.

Bug: 220176778
Test: atest AccessibilityGestureDetectorTest on cuttleFlish
Change-Id: Iecc5f928e2a6d476bafce647a079b78ed853f3f1
Merged-In: Iecc5f928e2a6d476bafce647a079b78ed853f3f1
1 file changed