Fix incorrect timing bug

Fix a bug where the client didn't actually ignore messages that were sent in the past. This could cause a server to stop running because it had been asked to stop in the past, forcing the Matrix room to spam enough messages until the command would no longer appear in the initial sync

main.py

@@ -1,4 +1,3 @@
-import src.mc_wrapper as mc_wrapper
 import src.mxclient as matrix_client
 
 import asyncio

src/mxclient.py

@@ -16,7 +16,7 @@ async def message_callback(room: MatrixRoom, event: RoomMessageText) -> None:
         return
     if event.sender == client.user_id:
         return
-    if int(event.server_timestamp) < STARTUP_TIME:
+    if int(event.server_timestamp) / 1000 < STARTUP_TIME:
         return
 
     # Determine how to display username