webui: do not create <hr> delimiter between sections

- section delimiter don't look good and limits UI
Their removal will allow:
- section hiding (needed in aci v2 UI)
- fluid section layout

prerequisite for:
https://fedorahosted.org/freeipa/ticket/4079

Reviewed-By: Adam Misnyovszki <amisnyov@redhat.com>
Reviewed-By: Petr Viktorin <pviktori@redhat.com>

install/ui/src/freeipa/details.js

@@ -626,10 +626,6 @@ exp.details_facet = IPA.details_facet = function(spec, no_init) {
         that.create_controls();
     };
 
-    that.widgets.create_widget_delimiter = function(container) {
-        container.append('<hr/>');
-    };
-
     /**
      * @inheritDoc
      */