admin: uses new "panel" method instead of old "with"

src/Admin/CategoryAdmin.php

src/Admin/ConfigurationAPIAdmin.php

src/Admin/ConfigurationContributionsAdmin.php

src/Admin/ConfigurationCustomJsCssAdmin.php

src/Admin/ConfigurationDuplicatesAdmin.php

src/Admin/ConfigurationFormAdmin.php

src/Admin/ConfigurationInfoBarAdmin.php

src/Admin/ConfigurationMailAdmin.php

src/Admin/ConfigurationMapAdmin.php

src/Admin/ConfigurationMarkerAdmin.php

src/Admin/ConfigurationMenuAdmin.php

src/Admin/ConfigurationMobileAdmin.php

src/Admin/ConfigurationOsmAdmin.php

src/Admin/ConfigurationSaasAdmin.php

src/Admin/ConfigurationStyleAdmin.php

src/Admin/Element/ElementAdminShowEdit.php

src/Admin/GoGoFormMapper.php

src/Admin/ImportAdmin.php

src/Admin/OptionAdmin.php

src/Admin/UserAdmin.php