minor change to /lfm to make 'type' a dropdown choice

bot.py

@@ -60,6 +60,10 @@ async def on_ready():
     dungeon="Name of the dungeon",
     level="Keystone level"
 )
+@app_commands.choices(type=[
+    app_commands.Choice(name="Pushing", value="pushing"),
+    app_commands.Choice(name="Completion", value="completion")
+])
 async def lfm(interaction: discord.Interaction, type: str, dungeon: str, level: int):
     # The ID of the allowed channel
     allowed_channel_id = 1297217492699320462  # Replace this with the correct channel ID