Fix typo in last updated time

app.py

@@ -233,7 +233,7 @@ def get_next_update_div(current_block: int, next_update_block: int) -> str:
     return f"""<div align="center" style="font-size: larger;">Next reward update: <b>{blocks_to_go}</b> blocks (~{int(delta.total_seconds() // 60)} minutes)</div>"""
 
 def get_last_updated_div() -> str:
-    return f"""<div>Last Updated: f{datetime.datetime.utcnow().strftime("%Y-%m-%d %H:%M:%S")} (UTC)</div>"""
+    return f"""<div>Last Updated: {datetime.datetime.utcnow().strftime("%Y-%m-%d %H:%M:%S")} (UTC)</div>"""
 
 def leaderboard_data(
     leaderboard: List[ModelData],