fixing tag name

docker/build/edxapp/Dockerfile

@@ -16,7 +16,7 @@ RUN sudo git pull
 WORKDIR /edx/app/edx_ansible/edx_ansible/docker/plays
 COPY ansible_overrides.yml /
 
-RUN sudo ansible-playbook edxapp.yml -c local -e "EDXAPP_PYTHON_SANDBOX=false" -t "install:base,install:configuration,install:application-requirements,install:code" -e@/ansible_overrides.yml
+RUN sudo ansible-playbook edxapp.yml -c local -e "EDXAPP_PYTHON_SANDBOX=false" -t "install:base,install:configuration,install:app-requirements,install:code" -e@/ansible_overrides.yml
 USER root
 WORKDIR /edx/app
 CMD ["/edx/app/supervisor/venvs/supervisor/bin/supervisord", "-n", "--configuration", "/edx/app/supervisor/supervisord.conf"]