Fix matrix-postgres stopping for consistency with other services

This probably got lost somehow in all the work that happened in
#456

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

@@ -8,7 +8,7 @@ DefaultDependencies=no
 [Service]
 Type=simple
 Environment="HOME={{ matrix_systemd_unit_home_path }}"
-ExecStartPre=-{{ matrix_host_command_docker }} stop matrix-postgres
+ExecStartPre=-{{ matrix_host_command_sh }} -c '{{ matrix_host_command_docker }} kill matrix-postgres 2>/dev/null'
 ExecStartPre=-{{ matrix_host_command_sh }} -c '{{ matrix_host_command_docker }} rm matrix-postgres 2>/dev/null'
 
 ExecStart={{ matrix_host_command_docker }} run --rm --name matrix-postgres \
@@ -34,7 +34,7 @@ ExecStart={{ matrix_host_command_docker }} run --rm --name matrix-postgres \
 			{{ arg }} \
 			{% endfor %}
 
-ExecStop=-{{ matrix_host_command_docker }} stop matrix-postgres
+ExecStop=-{{ matrix_host_command_sh }} -c '{{ matrix_host_command_docker }} kill matrix-postgres 2>/dev/null'
 ExecStop=-{{ matrix_host_command_sh }} -c '{{ matrix_host_command_docker }} rm matrix-postgres 2>/dev/null'
 Restart=always
 RestartSec=30