pdm: use field from PDM field library for Component default image

This fixes a problem that a broken image like

    <img src="?quality=75.0&amp;display=thumbnail&amp;format=png" alt="Image">

was displayed when no image have been uploaded.

This was working fine on product, this makes component aligned with
product for this field.

bt5/erp5_pdm/SkinTemplateItem/portal_skins/erp5_pdm/Component_view/my_default_image_absolute_url.xml

@@ -9,11 +9,7 @@
         <item>
             <key> <string>delegated_list</string> </key>
             <value>
-              <list>
-                <string>title</string>
-                <string>description</string>
-                <string>default</string>
-              </list>
+              <list/>
             </value>
         </item>
         <item>
@@ -73,30 +69,18 @@
             <key> <string>values</string> </key>
             <value>
               <dictionary>
-                <item>
-                    <key> <string>default</string> </key>
-                    <value> <string></string> </value>
-                </item>
-                <item>
-                    <key> <string>description</string> </key>
-                    <value> <string></string> </value>
-                </item>
                 <item>
                     <key> <string>field_id</string> </key>
-                    <value> <string>my_thumbnail</string> </value>
+                    <value> <string>my_default_image_absolute_url</string> </value>
                 </item>
                 <item>
                     <key> <string>form_id</string> </key>
-                    <value> <string>File_viewFieldLibrary</string> </value>
+                    <value> <string>Base_viewPDMFieldLibrary</string> </value>
                 </item>
                 <item>
                     <key> <string>target</string> </key>
                     <value> <string>Click to edit the target</string> </value>
                 </item>
-                <item>
-                    <key> <string>title</string> </key>
-                    <value> <string>Image</string> </value>
-                </item>
               </dictionary>
             </value>
         </item>