Fix synapse s3 storage provider container indentation

roles/custom/matrix-synapse/templates/synapse/customizations/Dockerfile.j2

@@ -1,11 +1,11 @@
 FROM {{ matrix_synapse_docker_image }}
 
 {% if matrix_synapse_container_image_customizations_s3_storage_provider_installation_enabled %}
-    {% if matrix_synapse_ext_synapse_s3_storage_provider_version == 'git' %}
+{% if matrix_synapse_ext_synapse_s3_storage_provider_version == 'git' %}
 RUN apt-get update -yq && apt-get install -yq git && pip install git+https://github.com/matrix-org/synapse-s3-storage-provider.git
-    {% else %}
+{% else %}
 RUN pip install synapse-s3-storage-provider=={{ matrix_synapse_ext_synapse_s3_storage_provider_version }}
-    {% endif %}
+{% endif %}
 {% endif %}
 
 {{ matrix_synapse_container_image_customizations_dockerfile_body_custom }}