[FIX] web: fix error handling of _applyChanges

After 5df4746c9a the error handling has
been changed inaccurately. This fix sets the error handling correctly.

closes odoo/odoo#32247

Signed-off-by: Aaron Bohy (aab) <aab@odoo.com>

addons/web/static/src/js/views/field_manager_mixin.js

@@ -52,7 +52,7 @@ var FieldManagerMixin = {
                 if (event.data.force_save) {
                     return self.model.save(dataPointID).then(function () {
                         return self._confirmSave(dataPointID);
-                    }, function /* on_failure */ () {
+                    }).guardedCatch(function () {
                         return self._rejectSave(dataPointID);
                     });
                 } else if (options.notifyChange !== false) {