Fix condition for gitlab_log_tmpfs feature

In the current way, no volume for gitlab logs would be created by
default. This is undesired.

roles/gitlab/templates/docker-compose.yml

@@ -203,7 +203,7 @@ services:
     volumes:
       - "{{ gitlab_data_location }}:/var/opt/gitlab"
       - "{{ gitlab_config_location }}:/etc/gitlab"
-{% if gitlab_log_tmpfs %}
+{% if not gitlab_log_tmpfs %}
       - "{{ gitlab_log_location }}:/var/log/gitlab"
 {% endif %}