Merge pull request #3942 from edx/mroytman/kill-dockerhub-forums

remove reference to edxops/forums and replace with edxop/forum

docker/compose/edx/docker-compose.yml

@@ -93,7 +93,7 @@ forum:
   # Image built from the opencraft fork as it fixes
   # an auth bug.  Update when the change merges
   # upstream
-  image: edxops/forums:opencraft-v2
+  image: edxops/forum:latest
   volumes:
     - ${DOCKER_EDX_ROOT}/cs_comments_service:/edx/app/forum/cs_comments_service
   ports: