Fix magnifier border isn't fixed when magnification is working

Overlay layer had been replaced by NonAppWindowContainers which should
ignore the magnify checking while apply the MagnificationSpec.

Bug: 147336371
Test: manual, enable magnifier and move
Change-Id: I83ee5f83dc2e018c934a94fd1f8f11f90402c1eb

services/core/java/com/android/server/wm/DisplayContent.java

@@ -4931,6 +4931,12 @@ class DisplayContent extends WindowContainer<DisplayContent.DisplayChildWindowCo
                 scheduleAnimation();
             }
         }
+
+        @Override
+        boolean shouldMagnify() {
+            // Omitted from Screen-Magnification
+            return false;
+        }
     }
 
     /**