pkp#9456 Remove migration on old XML migration schema

Author: nibou230

xml/schema/common.xml

@@ -231,34 +231,6 @@
 		</index>
 	</table>
 
-    <!--
-      *
-      * TABLE user_private_notes
-      *
-      -->
-    <table name="user_private_notes">
-        <field name="user_private_note_id" type="I8">
-            <KEY />
-            <AUTOINCREMENT />
-        </field>
-        <field name="context_id" type="I8">
-            <NOTNULL/>
-        </field>
-        <field name="user_id" type="I8">
-            <NOTNULL/>
-        </field>
-        <field name="note" type="X">
-            <NOTNULL/>
-            <DEFAULT VALUE=""/>
-        </field>
-        <descr>User private notes are an addition to the gossip, but this one is private to each context.</descr>
-        <index name="user_private_notes_context_id_user_id">
-            <col>context_id</col>
-            <col>user_id</col>
-            <UNIQUE />
-        </index>
-    </table>
-
 	<!--
 	  *
 	  * TABLE sessions