Fix One2Many remove -> unlink

tryton/gui/window/view_form/model/field.py

@@ -381,7 +381,7 @@ class O2MField(CharField):
                 result.append(('create',
                     model2.get(check_load=check_load, get_readonly=readonly)))
         if model.value[self.name].model_removed:
-            result.append(('remove', model.value[self.name].model_removed))
+            result.append(('unlink', model.value[self.name].model_removed))
         if model.value[self.name].model_deleted:
             result.append(('delete', model.value[self.name].model_deleted))
         return result