Allow cloning even if record is not writeable (#916)

* Allow cloning even if record is not writeable

The ability to clone does not depends on the source record being  writeable.

* Check pimcore.settings['data-hub-writeable']

src/Resources/public/js/config.js

@@ -209,7 +209,7 @@ pimcore.plugin.datahub.config = Class.create({
         menu.add(new Ext.menu.Item({
             text: t('clone'),
             iconCls: "pimcore_icon_clone",
-            disabled: !record.data['writeable'] || !this.userIsAllowedToCreate(record.data.adapter),
+            disabled: !pimcore.settings['data-hub-writeable'] || !this.userIsAllowedToCreate(record.data.adapter),
             handler: this.cloneConfiguration.bind(this, tree, record)
         }));
 
@@ -243,4 +243,4 @@ pimcore.plugin.datahub.config = Class.create({
         });
     }
 
-});
+});