Make "top destinations" config field configurable on store level

Author: avstudnitz

app/code/Magento/Backend/etc/adminhtml/system.xml

@@ -215,7 +215,7 @@
                     <label>European Union Countries</label>
                     <source_model>Magento\Directory\Model\Config\Source\Country</source_model>
                 </field>
-                <field id="destinations" translate="label" type="multiselect" sortOrder="40" showInDefault="1" showInWebsite="0" showInStore="0">
+                <field id="destinations" translate="label" type="multiselect" sortOrder="40" showInDefault="1" showInWebsite="1" showInStore="1">
                     <label>Top destinations</label>
                     <source_model>Magento\Directory\Model\Config\Source\Country</source_model>
                 </field>