fixed type in livekit image

roles/custom/matrix-livekit-server/templates/systemd/matrix-livekit-server.service.j2

@@ -19,7 +19,7 @@ ExecStartPre={{ devture_systemd_docker_base_host_command_docker }} create \
     --network=host \
     --mount type=bind,src={{ matrix_livekit_server_base_path }}/livekit.yaml,dst=/etc/livekit.yaml,ro \
 	--label-file={{ matrix_livekit_server_base_path }}/labels \
-    {{ matrix_livekit_image }} \
+    {{ matrix_livekit_server_image }} \
     --dev --config /etc/livekit.yaml
 
 ExecStart={{ devture_systemd_docker_base_host_command_docker }} start --attach matrix-livekit-server