Fix inverted vertical offset of entering rotated PiP

In rotated coordinates, the vertical and horizontal are
different directions. Otherwise the end of animation
doesn't match the destination position.

Bug: 175836469
Test: setSourceRectHint with non-zero left.
Change-Id: Ia5e282c0a1bab9cbf77e964b4a4bc8ea4514cfb9

libs/WindowManager/Shell/src/com/android/wm/shell/pip/PipSurfaceTransactionHelper.java

@@ -149,10 +149,10 @@ public class PipSurfaceTransactionHelper {
             // Shrink bounds (expand insets) in destination orientation.
             if (clockwise) {
                 positionX -= insets.top * scale;
-                positionY -= insets.left * scale;
+                positionY += insets.left * scale;
             } else {
                 positionX += insets.top * scale;
-                positionY += insets.left * scale;
+                positionY -= insets.left * scale;
             }
         }
         mTmpTransform.setScale(scale, scale);