[FIX] web: fix typo in X2ManyField props definition

Before this commit, the "addLabel" and "editable" props type was
not really tested.

closes odoo/odoo#112583

X-original-commit: bb060d012ff9dfe07fa75c851feafc0af2bfc0b5
Signed-off-by: Georis François (fge) <fge@odoo.com>
Signed-off-by: Aaron Bohy (aab) <aab@odoo.com>

addons/web/static/src/views/fields/x2many/x2many_field.js

@@ -247,8 +247,8 @@ export class X2ManyField extends Component {
 X2ManyField.components = { Pager, KanbanRenderer, ListRenderer, ViewButton };
 X2ManyField.props = {
     ...standardFieldProps,
-    addLabel: { type: "string", optional: true },
-    editable: { type: "string", optional: true },
+    addLabel: { type: String, optional: true },
+    editable: { type: String, optional: true },
 };
 X2ManyField.supportedTypes = ["one2many", "many2many"];
 X2ManyField.displayName = _lt("Relational table");