fix discord @ message without '!'

Author: SonodaHanami

kokkoro/bot/discord/discord_util.py

@@ -12,7 +12,7 @@ def remove_mention_me(raw_message) -> (str, bool):
         return raw_message.replace(MENTION_BOT, "").strip(), True
     return raw_message, False
 
-dc_at_pattern = r'<@![a-z0-9A-Z]+>'
+dc_at_pattern = r'<@!?[a-z0-9A-Z]+>'
 def normalize_message(raw_message: str) -> str:
     """
     规范化 at 信息，"<@!123> waht<@!312>a12" => "@123 waht @312 a12"
@@ -26,4 +26,7 @@ def normalize_at(raw_at):
     """
     规范化 at 信息，"<@!123>" => " @123 "
     """
-    return f' @{raw_at[3:-1]} '
+    if '!' in raw_at:
+        return f' @{raw_at[3:-1]} '
+    else:
+        return f' @{raw_at[2:-1]} '