chore(tabs): fix code style

Author: wesleycho

src/tabs/tabs.js

@@ -32,8 +32,7 @@ angular.module('ui.bootstrap.tabs', [])
       tab.active = true;
     } else if (tab.active) {
       ctrl.select(tab);
-    }
-    else {
+    } else {
       tab.active = false;
     }
   };