Rename 5 SVG text tests to reflect that they are for selection.

LayoutTests/platform/linux/svg/text/text-selection-text-05-t-expected.txt

 {
   "bounds": [800, 600],
   "children": [
     {
       "bounds": [800, 600],
       "contentsOpaque": true,
       "drawsContent": true,
       "repaintRects": [
         [590, 485, 95, 29],
         [590, 435, 62, 29],
@@ skipping 36 matching lines @@
         [16, 291, 76, 34],
         [16, 241, 76, 34],
         [16, 191, 76, 34],
         [16, 141, 76, 34],
         [16, 91, 76, 34]
       ]
     }
   ]
 }