refactor(MultiFingerMultiTap): Rename mDetectTriple to...

refactor(MultiFingerMultiTap): Rename mDetectTriple to mDetectSingleFingerTripleTap before implement TwoFingerTripleTap

1. Enhance naming accuracy to enable clear differentiation between new and existing features. Then add new boolean parameter, mDetectTwoFingerTripleTap, for feature.
2. Remove unnecessary local variables, mDetectTripleTap,  in Detecting State and use global variables directly.

Bug: 297805269
Test: manual
Test: atest MagnificationGestureHandlerTest
Test: atest WindowMagnificationGestureHandlerTest
Test: atest FullScreenMagnificationGestureHandlerTest
Change-Id: I94eb9bc6114a7d562e9f8f8f90970fa96e24c473