fix run button getting broken after closing last tab in a pane

package.json

@@ -102,7 +102,7 @@
         "c9.ide.recentfiles": "#7c099abf40",
         "c9.ide.remote": "#301d2ab519",
         "c9.ide.processlist": "#2b12cd1bdd",
-        "c9.ide.run": "#f360984649",
+        "c9.ide.run": "#0171586b2a",
         "c9.ide.run.build": "#0598fff697",
         "c9.ide.run.debug.xdebug": "#61dcbd0180",
         "c9.ide.save": "#4a4a60a004",