Honor the system orientation lock #144

Revert "Fix unlockAllOrientations on Android (#133)"

This reverts commit 7a7db41.

Refer to the issue for more information, particularly this comment:
#144 (comment)

android/src/main/java/org/wonday/orientation/OrientationModule.java

@@ -309,7 +309,7 @@ public void unlockAllOrientations() {
 
         final Activity activity = getCurrentActivity();
         if (activity == null) return;
-        activity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_SENSOR);
+        activity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED);
         isLocked = false;
 
         //force send an UI orientation event when unlock