[FIX] web_editor: fix drag and drop tooltip

Since [commit 1], the tooltip that appears when a user clicks on a
snippet (instead of dragging it) is no longer displayed.

The reason is because [commit 1] replaced jQueryUI with Odoo's own code
and that triggers `preventDefault` on the `pointerdown` event which then
cancels `mousedown` and thus prevents the mousedown call back that
displays the tooltip.

To fix this, this commit replaces mousedown and mouseup events on the
`SnippetsMenu` by pointerdown and pointerup.

[commit 1]: https://github.com/odoo/odoo/commit/7594d71ca8610d5947e80f325ccb57abc23c2c76

task-3582562

closes odoo/odoo#141026

Signed-off-by: Soukéina Bojabza (sobo) <sobo@odoo.com>

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

@@ -1744,8 +1744,8 @@ var SnippetsMenu = Widget.extend({
         'click .o_we_invisible_entry': '_onInvisibleEntryClick',
         'click #snippet_custom .o_rename_btn': '_onRenameBtnClick',
         'click #snippet_custom .o_delete_btn': '_onDeleteBtnClick',
-        'mousedown': '_onMouseDown',
-        'mouseup': '_onMouseUp',
+        'pointerdown': '_onMouseDown',
+        'pointerup': '_onMouseUp',
         'input .o_snippet_search_filter_input': '_onSnippetSearchInput',
         'click .o_snippet_search_filter_reset': '_onSnippetSearchResetClick',
         'click .o_we_website_top_actions button[data-action=save]': '_onSaveRequest',