core: rename PropertySheetChild_validateIDField

PropertySheetChild is not an acceptable prefix, use Base as the context
is used. Technically, this uses the "id as reference" mixin, but this
mixin is a bit special as it has takes the suffix as parameter and does
not reside in mixin module, so we just use Base as a prefix.

product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/PropertySheetChild_validateIDField.xml → product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/Base_validateIDAsReferenceSuffix.xml

@@ -54,7 +54,7 @@
         </item>
         <item>
             <key> <string>id</string> </key>
-            <value> <string>PropertySheetChild_validateIDField</string> </value>
+            <value> <string>Base_validateIDAsReferenceSuffix</string> </value>
         </item>
       </dictionary>
     </pickle>

product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/Base_viewFieldLibrary/my_view_mode_id_as_reference.xml

@@ -116,7 +116,7 @@
       <dictionary>
         <item>
             <key> <string>method_name</string> </key>
-            <value> <string>PropertySheetChild_validateIDField</string> </value>
+            <value> <string>Base_validateIDAsReferenceSuffix</string> </value>
         </item>
       </dictionary>
     </pickle>