Move paint invalidation after compositing update

LayoutTests/compositing/squashing/resize-squashing-layer-that-needs-full-repaint-expected.txt

 {
   "bounds": [800, 600],
   "children": [
     {
       "bounds": [800, 600],
       "contentsOpaque": true,
       "drawsContent": true,
       "children": [
         {
           "children": [
             {
               "position": [8, 8],
               "bounds": [500, 500]
             },
             {
               "position": [55, 55],
               "bounds": [500, 500],
               "drawsContent": true,
               "repaintRects": [
                 [55, 55, 500, 500],
                 [0, 0, 500, 500],
+                [0, 0, 500, 500],
                 [0, 0, 50, 50]
               ]
             }
           ]
         }
       ]
     }
   ]
 }