Migrate svg layout tests to use slimming paint by default

LayoutTests/svg/repaint/container-repaint-expected.txt

 {
   "bounds": [800, 600],
   "children": [
     {
       "bounds": [800, 600],
       "contentsOpaque": true,
       "drawsContent": true,
       "repaintRects": [
         [0, 100, 100, 50],
         [0, 100, 100, 50],
         [0, 50, 100, 50],
         [0, 50, 100, 50]
+      ],
+      "paintInvalidationClients": [
+        "LayoutSVGViewportContainer svg id='mover'",
+        "LayoutSVGRect rect"
       ]
     }
   ]
 }