Get the current value of the HideDefaultThemes setting

• command: spo hidedefaultthemes get

More details: see https://docs.microsoft.com/en-us/sharepoint/dev/declarative-customization/site-theming/sharepoint-site-theming-powershell#get-spohidedefaultthemes

REST API exposed via https://tenant/thememanager/GetHideDefaultThemes