Fixing typo in swipe helper causing views not to be faded when swiped.

Bug: 63516235
Test: Enable flag to fade when swiped and verify it fades
Change-Id: I49e7840d5423d018c1f88a02e8b272c80d0143a2

packages/SystemUI/src/com/android/systemui/SwipeHelper.java

@@ -203,7 +203,7 @@ public class SwipeHelper implements Gefingerpoken {
             return Math.max(1 - progress, 0);
         }
 
-        return Math.min(0, Math.max(1, progress / SWIPE_PROGRESS_FADE_END));
+        return 1f - Math.max(0, Math.min(1, progress / SWIPE_PROGRESS_FADE_END));
     }
 
     private void updateSwipeProgressFromOffset(View animView, boolean dismissable) {