[FIX] web_editor: prevent traceback on reposition background image

closes odoo/odoo#63413

X-original-commit: 9cd778e683a5978c920bb0d367b3eb01ddf21c6f
Signed-off-by: David Monjoie (dmo) <dmo@odoo.com>

addons/web_editor/static/src/js/editor/snippets.options.js

@@ -4329,7 +4329,7 @@ registry.BackgroundPosition = SnippetOptionWidget.extend({
         this.$overlayBackground = this.$overlayContent.find('.o_overlay_background');
 
          this.$backgroundOverlay.on('click', '.o_btn_apply', async () => {
-            await this.wysiwyg.withDomMutations(() => {
+            await this.wysiwyg.withDomMutations(this.$target, () => {
                 this.$target.css('background-position', this.$bgDragger.css('background-position'));
             });
             this._toggleBgOverlay(false);