(css) Improve subheaders with no buttons

UI/Templates/ContactsUI/UIxContactFoldersView.wox

@@ -155,7 +155,7 @@
         </section>
         <!-- Remote/domain addressbooks -->
         <section>
-          <md-subheader class="sg-md-subheader md-padding">
+          <md-subheader class="sg-md-subheader">
             <var:string label:value="Global Addressbooks"/>
           </md-subheader>
           <md-list>

UI/WebServerResources/scss/components/subheader/subheader.scss

@@ -1,9 +1,9 @@
 /// subheader.scss -*- Mode: scss; indent-tabs-mode: nil; basic-offset: 2 -*-
 @import 'extends';
 
-// Temporary patch until mdsubheaders are faster in Chrome
 .md-subheader {
   margin-right: 0;
+  line-height: $touch-zone-width;
 }
 
 .md-subheader {