The "EnableATToolSupport" setting/property that can be queried from desktop backend implementations doesn't seem to be used anywhere, so drop it. There is still MiscSettings::GetEnableATToolSupport, but that doesn't make use of the above. Change-Id: I1ce64101d9795356e87e29c598dde25579a73111 Reviewed-on: https://gerrit.libreoffice.org/c/core/+/185071 Tested-by: Jenkins Reviewed-by: Michael Weghorn <m.weghorn@posteo.de>