Remove unnecessary `matrix_bot_draupnir_admin_api_enabled` override from `group_vars/matrix_servers`

The same value is now (more appropriately) defined in Draupnir's `defaults/main.yml` file anyway.

group_vars/matrix_servers

@@ -3175,8 +3175,6 @@ matrix_bot_draupnir_container_image_self_build: "{{ matrix_architecture not in [
 
 matrix_bot_draupnir_container_network: "{{ matrix_addons_container_network }}"
 
-matrix_bot_draupnir_admin_api_enabled: "{{ matrix_bot_draupnir_config_admin_enableMakeRoomAdminCommand }}"
-
 matrix_bot_draupnir_container_additional_networks_auto: |-
   {{
     (