Ensure lab auth is current before delete

src/mobu/services/business/nublado.py

@@ -175,6 +175,7 @@ async def execute(self) -> None:
             await self.execute_code(session)
         if self.options.delete_lab:
             await self.hub_login()
+            await self.lab_login()
             await self.delete_lab()
 
     async def execution_idle(self) -> bool: