Explore by touch enabled when screen magnification is on.

1. A recently added check was preventing touch exploration being
   disabled when the last touch exploring service was turned off.
   As a consequence enabling explore by touch was initializing the
   input filter with the magnification and the not disabled
   screen magnification features.
bug:7256223

Change-Id: I9ed5457705d625805462e4d316b2c8a5af9aabca

Author: sganov

services/java/com/android/server/accessibility/AccessibilityManagerService.java

@@ -1206,9 +1206,6 @@ private void tryEnableTouchExplorationLocked(final Service service) {
     }
 
     private void tryDisableTouchExplorationLocked(Service service) {
-        if (!service.canReceiveEvents()) {
-            return;
-        }
         UserState userState = getUserStateLocked(service.mUserId);
         if (userState.mIsTouchExplorationEnabled) {
             final int serviceCount = userState.mServices.size();