Fix time zone in both commands and format code with Black

discord_reminder_bot/main.py

@@ -185,6 +185,7 @@ async def command_add(
         f"{message_date}",
         settings={
             "PREFER_DATES_FROM": "future",
+            "TIMEZONE": f"{config_timezone}",
             "TO_TIMEZONE": f"{config_timezone}",
         },
     )