Use a proper (bool) value for the `matrix_bot_draupnir_login_native` variable

Otherwise Ansible casts the "" string to a bool.
This works, but it's deprecated and a bad idea anyway.

roles/custom/matrix-bot-draupnir/defaults/main.yml

@@ -101,7 +101,7 @@ matrix_bot_draupnir_password: "{{ matrix_bot_draupnir_pantalaimon_password }}"
 # Controls if we activate the config block for Pantalaimon for now. Its name will
 # probably be changed for our usecase due to Draupnir's push to scrub Pantalaimon from the codebase.
 # This configuration option does not follow the common naming schema as its not controlling a config key directly.
-matrix_bot_draupnir_login_native: ""
+matrix_bot_draupnir_login_native: false
 
 # The room ID where people can use the bot. The bot has no access controls, so
 # anyone in this room can use the bot - secure your room!