Revert "Set BOUNCER_URL for demos to be the dev bouncer, for all demos (#13981)" (#13982)

This reverts commit 08cc575e7b.

gcp/bedrock-demos/cloudrun/mozorg-demo.env.yaml

@@ -5,7 +5,6 @@
 # learn how to do this.
 
 ALLOWED_HOSTS: .allizom.org,.moz.works,.run.app
-BOUNCER_URL: https://dev.bouncer.nonprod.webservices.mozgcp.net/
 CONTENT_CARDS_URL: https://www-dev.allizom.org/media/
 CSP_DEFAULT_SRC: "*.allizom.org"
 CSP_EXTRA_FRAME_SRC: "*.mozaws.net,o1069899.sentry.io"