slapos_cloud: Set wechat default preferences for testing purpose

 Those values shouldn't be applied on production

master/bt5/slapos_cloud/PreferenceTemplateItem/portal_preferences/slapos_default_system_preference.xml

@@ -281,6 +281,14 @@
             <key> <string>preferred_web_message_template</string> </key>
             <value> <string>event_module/slapos_crm_web_message_template</string> </value>
         </item>
+        <item>
+            <key> <string>preferred_wechat_integration_site</string> </key>
+            <value> <string>portal_integrations/slapos_wechat_test_integration</string> </value>
+        </item>
+        <item>
+            <key> <string>preferred_wechat_payment_service_reference</string> </key>
+            <value> <string>PSERV-Wechat-Test</string> </value>
+        </item>
         <item>
             <key> <string>priority</string> </key>
             <value> <int>1</int> </value>