Fix grep command in chat window

Commit d75ebd95e5 modified the return value of logger.py's method
get_search_results_for_query by appending another component to the
tuple. Because of this unpacking the tuple in the command system's grep
command failed.

src/command_system/implementation/standard.py

@@ -100,7 +100,7 @@ class StandardCommonCommands(CommandContainer):
                 raise CommandError(_("Limit must be an integer"))
 
         for row in results:
-            contact, time, kind, show, message, subject = row
+            contact, time, kind, show, message, subject, log_line_id = row
 
             if not contact:
                 if kind == KindConstant.CHAT_MSG_SENT: