GUACAMOLE-220: Add semantic CSS class for headers having corresponding tabs.

guacamole/src/main/webapp/app/settings/styles/settings.css

@@ -17,10 +17,6 @@
  * under the License.
  */
 
-.settings .header {
-    margin-bottom: 0;
-}
-
 .settings table.properties th {
     text-align: left;
     font-weight: normal;

guacamole/src/main/webapp/app/settings/templates/settings.html

@@ -1,7 +1,7 @@
 
 <div class="view">
 
-    <div class="header">
+    <div class="header tabbed">
         <h2>{{'SETTINGS.SECTION_HEADER_SETTINGS' | translate}}</h2>
         <guac-user-menu></guac-user-menu>
     </div>