Add Draupnir Admin API required config validation.

roles/custom/matrix-bot-draupnir/tasks/validate_config.yml

@@ -37,6 +37,7 @@
     - {'name': 'matrix_bot_draupnir_config_rawHomeserverUrl', when: true}
     - {'name': 'matrix_bot_draupnir_pantalaimon_username', when: "{{ matrix_bot_draupnir_pantalaimon_use }}"}
     - {'name': 'matrix_bot_draupnir_pantalaimon_password', when: "{{ matrix_bot_draupnir_pantalaimon_use }}"}
+    - {'name': 'matrix_bot_draupnir_admin_api_enabled', when: "{{  matrix_bot_draupnir_config_admin_enableMakeRoomAdminCommand }}"}
   when: "item.when | bool and (vars[item.name] == '' or vars[item.name] is none)"
 
 - name: Fail if inappropriate variables are defined