add fixed width class, replaced pficon-close with fa-times
add fixed width class, replaced pficon-close with fa-times

Issue: #3717
(transferred from ManageIQ/manageiq@9a874b78c06683766c2fb12ad89040c718400d5c)

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