Fix error on localized worker settings screen
Fix error on localized worker settings screen

For worker memory threshold, we should be saving numbers, not
translated strings (e.g. en: "500 MB" -> fr: "500 Mo")

https://bugzilla.redhat.com/show_bug.cgi?id=1589122

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