[TECH SUPPORT] LPS-45874 Assign Site Roles menu is available but Site Roles cannot be assigned

Hi Tibi,

ASSIGN_USER_ROLES is necessary for adding Site roles to Users, however ASSIGN_MEMBERS was checked.

When a User gets removed from a Site, ASSIGN_MEMBERS is checked so I kept that check for the action URL (even though you cannot reach the Site Membership if you don't have ASSIGN_MEMBERS).

UsersAdminUtil.filterGroupRoles filters the roles out if you don't have ASSIGN_USER_ROLES, that's why list of Roles is empty before the fix.

Please review the changes.

Thanks,
Ákos