revert change to tab behaviors which broke revealtab command

package.json

@@ -80,7 +80,7 @@
         "c9.ide.ace.split": "#0ae0151c78",
         "c9.ide.ace.statusbar": "#d95be89d53",
         "c9.ide.ace.stripws": "#cf0f42ac59",
-        "c9.ide.behaviors": "#9f0ff4a2a6",
+        "c9.ide.behaviors": "#5e58269f29",
         "c9.ide.closeconfirmation": "#a28bfd8272",
         "c9.ide.configuration": "#a17478a2e5",
         "c9.ide.dialog.wizard": "#7667ec79a8",