Restore SmartThings capabilities

[Issue] http://suprem.sec.samsung.net/jira/browse/TIZENWF-2745
[Problem] Dimmer widget is not synchronized wich Slider if they
          have the same capability (OICDimming)
[Solution] Revert commit 8bf5910
           which disabled this option.

design-editor/src/panel/property/attribute/templates/attribute-element.html

@@ -24,15 +24,15 @@
     <ul class="closet-attribute-element-list closet-property-list closet-property-list-close"></ul>
 
     <!-- smart things -->
-    <!-- <div class="panel-heading closet-property-list-title">
+    <div class="panel-heading closet-property-list-title">
             <div class="closet-property-header">
                 <div class="closet-property-anchor">
                     <span class="fa fa-caret-right closet-property-list-title-icon"></span>
-                    <span class="title">Smart Things  - coming soon</span>
+                    <span class="title">Smart Things</span>
                 </div>
             </div>
         </div>
-        <ul class="closet-attribute-element-smartthings closet-property-list closet-property-list-close"></ul> -->
+        <ul class="closet-attribute-element-smartthings closet-property-list closet-property-list-close"></ul>
 
     <!-- box model -->
     <div class="panel-heading closet-property-list-title">