Update roles/matrix-prometheus/templates/systemd/matrix-prometheus.service.j2

Co-authored-by: Slavi Pantaleev <slavi@devture.com>

roles/matrix-prometheus/templates/systemd/matrix-prometheus.service.j2

@@ -31,8 +31,7 @@ ExecStart={{ matrix_host_command_docker }} run --rm --name matrix-prometheus \
 			{% for arg in matrix_prometheus_container_extra_arguments %}
 			{{ arg }} \
 			{% endfor %}
-			{{ matrix_prometheus_docker_image }} \
-			{{ matrix_prometheus_process_extra_arguments|join(' ') }}
+			{{ matrix_prometheus_docker_image }} {{ matrix_prometheus_process_extra_arguments|join(' ') }}
 
 ExecStop=-{{ matrix_host_command_sh }} -c '{{ matrix_host_command_docker }} kill matrix-prometheus 2>/dev/null || true'
 ExecStop=-{{ matrix_host_command_sh }} -c '{{ matrix_host_command_docker }} rm matrix-prometheus 2>/dev/null || true'