Fixing rounding error when computing bottom clip

- In TaskThumbnailView.updateThumbnailMatrix() we compare the rounded
  scaled bitmap height with the height of the task/thumbnail view.
  Since the position is also non-integer, the rounding of the sum
  is not equivalent to the rounding of the individual components, which
  causes the check to fail.

Bug: 135150767
Test: Quickswitch on sargo
Change-Id: I849b4732569e5b8699f00f5ff210f41fb505f1e7

quickstep/src/com/android/quickstep/util/LayoutUtils.java

@@ -110,7 +110,7 @@ public class LayoutUtils {
         float y = insets.top + Math.max(topIconMargin,
                 (launcherVisibleHeight - extraVerticalSpace - outHeight) / 2);
         outRect.set(Math.round(x), Math.round(y),
-                Math.round(x + outWidth), Math.round(y + outHeight));
+                Math.round(x) + Math.round(outWidth), Math.round(y) + Math.round(outHeight));
     }
 
     public static int getShelfTrackingDistance(Context context, DeviceProfile dp) {