Fix uninstall (for real this time)

roles/matrix-bot-maubot/tasks/setup_uninstall.yml

@@ -2,7 +2,7 @@
 
 - name: Check existence of matrix-maubot service
   stat:
-    path: "{{ matrix_systemd_path }}/matrix-maubot.service"
+    path: "{{ matrix_systemd_path }}/matrix-bot-maubot.service"
   register: matrix_bot_maubot_service_stat
 
 - name: Ensure matrix-bot-maubot is stopped