Allow database user to create databases

Since we are importing only parts of another role, we missed to include
this new part after some update. This should give the database user the
permission to create its database again.

roles/dbserver/tasks/postgresql.yml

@@ -33,3 +33,12 @@
         login_password: "{{ db_password }}"
         lc_collate: "{{ postgres_encoding }}"
         lc_ctype: "{{ postgres_encoding }}"
+
+- include_role:
+    name: geerlingguy.postgresql
+    tasks_from: users_props
+  vars:
+    postgresql_user: postgres
+    postgresql_users:
+      - name: "{{ db_user }}"
+        role_attr_flags: "{{ db_user_roles }}"