[REF] bit cleanup code

mail_move_message_models.py

@@ -140,8 +140,7 @@ class mail_message(models.Model):
         moved_by_message_id = self.id
         moved_by_user_id = self.env.user.id
         first_move = not self.moved_by_user_id
-        vals = {'parent_id': parent_id,
-                'moved_by_user_id': moved_by_user_id}
+        vals = {'parent_id': parent_id}
         if first_move:
             # moved_from_* variables contain not last, but original
             # reference

mail_move_message_views.xml

@@ -23,7 +23,7 @@
             </group>
 			<group attrs="{'invisible':[('can_move', '=', False)]}">
 				<field name="parent_id" domain="[('parent_id','=', False)]" context="{'extended_name':1}" />
-				<field name="move_back" attrs="{'invisible':[('message_moved_by_message_id','=',False)]}"/>
+				<field name="move_back" attrs="{'invisible':[('message_moved_by_user_id','=',False)]}"/>
 				<field name="model_id" class="oe_inline" />
 				<field name="res_id" class="oe_inline" />
 				<field name="record_url" class="oe_inline" widget="url"/>