Fixed bug 3427 - Android accelerometer z-axis incorrect

Alex Szpakowski

As seen here https://bitbucket.org/rude/love/issues/1202/accelerometer-z-axis , the Java code for sending accelerometer data to SDL's C code has an incorrect Z-axis calculation.

android-project/src/org/libsdl/app/SDLActivity.java

@@ -1395,7 +1395,7 @@ class SDLSurface extends SurfaceView implements SurfaceHolder.Callback,
             }
             SDLActivity.onNativeAccel(-x / SensorManager.GRAVITY_EARTH,
                                       y / SensorManager.GRAVITY_EARTH,
-                                      event.values[2] / SensorManager.GRAVITY_EARTH - 1);
+                                      event.values[2] / SensorManager.GRAVITY_EARTH);
         }
     }
 }