Fix occurrence highlighting not redrawing on backspace

Apparently, we have a 1-character selection when we backspace?!

package.json

@@ -55,7 +55,7 @@
         "c9"
     ],
     "c9plugins": {
-        "c9.ide.language": "#9b9ea74f28",
+        "c9.ide.language": "#f2ca50a521",
         "c9.ide.language.css": "#ef8a28943e",
         "c9.ide.language.generic": "#77d43cfaf0",
         "c9.ide.language.html": "#99efa2853f",