add class to share button

package.json

@@ -67,7 +67,7 @@
         "c9.ide.language.javascript.infer": "#325ac6880e",
         "c9.ide.language.jsonalyzer": "#7791dec360",
         "c9.ide.language.codeintel": "#046d39603b",
-        "c9.ide.collab": "#00bd850bba",
+        "c9.ide.collab": "#0d7395b2e3",
         "c9.ide.local": "#10eb45842a",
         "c9.ide.find": "#e33fbaed2f",
         "c9.ide.find.infiles": "#c0a13737ef",