[FIX] web_editor: fix link label not getting updated

Before this commit:

After clicking one button and then clicking another, the link label didn't
update on the link tools.

After this commit:

The link label now updates when clicking from one button to another.

task-3514717

closes odoo/odoo#144954

X-original-commit: 372c86b70b20ee3992e6376d9b6dba3c3a4b78bc
Signed-off-by: Geelen Sébastien (sge) <sge@odoo.com>

addons/web_editor/static/src/js/wysiwyg/widgets/link_tools.js

@@ -55,6 +55,7 @@ export class LinkTools extends Link {
             this.$link = newProps.link ? $(newProps.link) : this.link;
             this._setSelectOptionFromLink();
             this._updateOptionsUI();
+            this._updateLabelInput();
         });
         onMounted(() => {
             this._observer = new MutationObserver(records => {