Delete useless str() at list_tabs() from Protocol

Author: neyberson

devtools/protocol.py

@@ -19,7 +19,7 @@ def create_tab(self):
     def list_tabs(self):
         print("Tabs".center(50, "-"))
         for target_id in self.tabs.keys():
-            print(str(target_id).center(50, " "))
+            print(target_id.center(50, " "))
         print("End".center(50, "-"))
 
     def close_tab(self, tab_id):