Use opacity for disabled domains in TreeNode::MiqAeNamespace
Use opacity for disabled domains in TreeNode::MiqAeNamespace

Fixes https://bugzilla.redhat.com/show_bug.cgi?id=1745589

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