xep-0308: update the UI upon sending a corrected message

So far we don't do this for encrypted messages. Still needs to be done.
And MUC also needs to be done.

src/command/cmd_funcs.c

@@ -8716,6 +8716,7 @@ cmd_correct(ProfWin *window, const char *const command, gchar **args)
         */
         // speciel send with replace tag
         cl_ev_send_msg_correct(chatwin, args[0], FALSE, TRUE);
+        return TRUE;
     }
 
     win_println(window, THEME_DEFAULT, '!', "Command /correct only valid in regular chat windows.");