Fix Manage policies button for Container Images
Fix Manage policies button for Container Images

Fixes https://bugzilla.redhat.com/show_bug.cgi?id=1530259

Add missing assign_policies method calling to button method to
make managing policies work for Container Images, Replicators etc.

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