Fix typo in variable name

roles/matrix-bot-maubot/defaults/main.yml

@@ -17,7 +17,7 @@ matrix_bot_maubot_bot_server_public: "https://{{ matrix_server_fqn_matrix }}"
 matrix_bot_maubot_proxy_management_interface: false
 matrix_bot_maubot_expose_management_interface: true
 
-matrix_bot_database_uri: 'sqlite:///data/maubot.db'
+matrix_bot_maubot_database_uri: 'sqlite:////data/maubot.db'
 matrix_bot_maubot_port: 29316
 matrix_bot_maubot_secret: 'generate'