slapos_panel: drop useless field tales which hide the content

master/bt5/slapos_panel/SkinTemplateItem/portal_skins/slapos_panel/WebSection_viewSlapOSRenderJSPreference/my_configuration_slapos_master_api.xml

@@ -56,9 +56,7 @@
               <dictionary>
                 <item>
                     <key> <string>default</string> </key>
-                    <value>
-                      <persistent> <string encoding="base64">AAAAAAAAAAI=</string> </persistent>
-                    </value>
+                    <value> <string></string> </value>
                 </item>
                 <item>
                     <key> <string>description</string> </key>
@@ -117,17 +115,4 @@
       </dictionary>
     </pickle>
   </record>
-  <record id="2" aka="AAAAAAAAAAI=">
-    <pickle>
-      <global name="TALESMethod" module="Products.Formulator.TALESField"/>
-    </pickle>
-    <pickle>
-      <dictionary>
-        <item>
-            <key> <string>_text</string> </key>
-            <value> <string>python: here.getLayoutProperty("configuration_slapos_master_web_url", default="")</string> </value>
-        </item>
-      </dictionary>
-    </pickle>
-  </record>
 </ZopeData>