Replace bare Dataloader() with pre-loaded play._loader (#917)
Replace bare Dataloader() with pre-loaded play._loader (#917)

The play._loader already exists. It is pre-loaded with
play._loader._vault.secrets, play._loader.FILE_CACHE, etc.
There's little point in creating a fresh Dataloader()
and having to process or load it up.
buluma/trellis,buluma/trellis,roots/bedrock-ansible,kalenjohnson/trellis,jeffstieler/bedrock-ansible,Twansparant/trellis-db-sync,cimocimocimo/cimo-wordpress-server,pressbooks/trellis,kalenjohnson/trellis,buluma/trellis,NicBeltramelli/trellis,partounian/trellis,newtonne/trellis,jeffstieler/bedrock-ansible,roots/trellis,NicBeltramelli/trellis,roots/trellis,cimocimocimo/cimo-wordpress-server,Twansparant/trellis-db-sync,pressbooks/trellis,Twansparant/trellis-db-sync,Twansparant/trellis-db-sync,partounian/trellis,NicBeltramelli/trellis,kalenjohnson/trellis,NicBeltramelli/trellis,buluma/trellis,roots/bedrock-ansible,proteusthemes/pt-ops,jeffstieler/bedrock-ansible,cimocimocimo/cimo-wordpress-server,kalenjohnson/trellis,newtonne/trellis,cimocimocimo/cimo-wordpress-server,proteusthemes/pt-ops,proteusthemes/pt-ops,partounian/trellis,newtonne/trellis,partounian/trellis