Always adjust event location to the middle of two fingers when two-finger dragging in TouchExplorer

No need to check the min distsance, always adjust the event location.
Remove mScaledMinPointerDistanceToUseMiddleLocation and
MIN_POINTER_DISTANCE_TO_USE_MIDDLE_LOCATION_DIP.

Bug: 134124639
Test: atest TouchExplorerTest
Change-Id: I8be1d665e307d0191aecef3f6f16d825514ce628
1 file changed