Settings/Advanced - use warning icon and background for the Caution warning
Settings/Advanced - use warning icon and background for the Caution warning

previously the background was an error background, and the icon doesn't exist

fixed to match https://www.patternfly.org/styles/icons/

ManageIQ/manageiq-ui-classic,ManageIQ/manageiq-ui-classic,ManageIQ/manageiq-ui-classic,ManageIQ/manageiq-ui-classic