toolboxLocationType doesn't include the "none" option which allows hiding a toolbox

[JaneSjs]

https://github.com/surveyjs/survey-creator/blob/968a761905e19b36f2b1ebf28bf459b4d8f9fc20/packages/survey-creator-core/src/creator-base.ts#L108

To hide the toolbox, it is necessary to set the creator.toolboxLocation property to "none". However, toolboxLocationType doesn't actually include the "none" option.