Use CSS mode_completer only in SSH mode

package.json

@@ -57,7 +57,7 @@
     "c9plugins": {
         "c9.ide.language": "#ebc064ef16",
         "c9.ide.language.css": "#be07d72209",
-        "c9.ide.language.generic": "#61a7d4f7b0",
+        "c9.ide.language.generic": "#bd4acfc645",
         "c9.ide.language.html": "#22fdc74869",
         "c9.ide.language.html.diff": "#24f3608d26",
         "c9.ide.language.javascript": "#d1a479805c",