Correctly refresh the screen on ^G on roster commands

src/tabs.py

@@ -918,6 +918,7 @@ class RosterInfoTab(Tab):
     def reset_help_message(self, _=None):
         curses.curs_set(0)
         self.input = self.default_help_message
+        self.core.refresh_window()
         return True
 
     def execute_slash_command(self, txt):

src/windows.py

@@ -1081,6 +1081,7 @@ class CommandInput(Input):
         self.key_func['^M'] = self.success
         self.key_func['\n'] = self.success
         self.key_func['^G'] = self.abort
+        self.key_func['^C'] = self.abort
 
     def do_command(self, key):
         res = Input.do_command(self, key)