style: ruff nits in the my-bookings slice

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

services.py

@@ -155,7 +155,8 @@ async def public_room_views(rooms: list[Room]) -> list[dict]:
 async def list_guest_bookings(guest_pubkey: str) -> list[dict]:
     """The caller's own bookings (identity established by the door: LNbits
     account pubkey over HTTP, signed sender_pubkey over RPC)."""
-    return [guest_booking_dict(b) for b in await crud.get_bookings_for_guest(guest_pubkey)]
+    rows = await crud.get_bookings_for_guest(guest_pubkey)
+    return [guest_booking_dict(b) for b in rows]
 
 
 # A guest calendar asks for a year by default; cap the window so a bad client