[FIX] web_editor: remove observerUnactive before adding tooltip

Since [1], the tooltip is not longer the jQuery-UI or Bootstrap one, but
the popover service with the Tooltip component, which does not make
changes to the editable DOM when being added or removed. This means that
switching the observer off before opening the tooltip is no longer
necessary.

[1]: https://github.com/odoo/odoo/commit/08cd27cc8ad78d2ee9ffe80ddb9e1cc50a557ee2

closes odoo/odoo#141882

Signed-off-by: Nicolas Bayet (nby) <nby@odoo.com>

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

@@ -2178,9 +2178,7 @@ export class Wysiwyg extends Component {
                 }
                 // Tooltips need to be cleared before leaving the editor.
                 this.saving_mutex.exec(() => {
-                    this.odooEditor.observerUnactive();
                     const removeTooltip = this.popover.add(e.target, Tooltip, { tooltip: _t('Double-click to edit') });
-                    this.odooEditor.observerActive();
                     this.tooltipTimeouts.push(setTimeout(() => removeTooltip(), 800));
                 });
             }, 400));