Fix pg_dump_command placement in borgmatic config

pg_dump_command must be nested under each database entry, not at the
top level.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

ansible/roles/borgmatic/templates/config.yaml.j2

@@ -35,14 +35,14 @@ keep_yearly: {{ borgmatic_keep_yearly }}
 
 {% if borgmatic_postgresql_databases %}
 # PostgreSQL database backups (streamed via pg_dump)
-{% if borgmatic_pg_dump_command is defined %}
-pg_dump_command: {{ borgmatic_pg_dump_command }}
-{% endif %}
 postgresql_databases:
 {% for db in borgmatic_postgresql_databases %}
     - name: {{ db.name }}
       hostname: {{ db.hostname | default('localhost') }}
       port: {{ db.port | default(5432) }}
       username: {{ db.username }}
+{% if borgmatic_pg_dump_command is defined %}
+      pg_dump_command: {{ borgmatic_pg_dump_command }}
+{% endif %}
 {% endfor %}
 {% endif %}