fix(magnification fling): add stop fling test to controller test

Fix: 319175022
Flag: ACONFIG services.accessibility.fullscreen_fling_gesture DISABLED
Test: atest com.android.server.accessibility.magnification.FullScreenMagnificationControllerTest
Change-Id: I01ea9c445379c7f5ea476cc97ce8959e8d644185
4 files changed