[FIX] theme_test_custo: fix nightly theme preview tour

The theme preview feature before selection was disabled in [1]. This
commit disables the related tour steps that were testing it a nightly
tour... that was red since then.

[1]: https://github.com/odoo/odoo/commit/7cb71e9479df0ee9af0b7ad39302857666726177

Related to task-3454790

closes odoo/design-themes#1080

X-original-commit: 9580ef86ac
Related: odoo/odoo#210221
Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>

theme_test_custo/static/tests/tours/website_theme_preview.js

@@ -26,6 +26,9 @@ registry.category("web_tour.tours").add("website_theme_preview", {
 }, {
     content: "Click on the Live preview of a theme",
     trigger: ".o_theme_preview button:not(:visible)",
+/*
+TODO The feature that the following steps are testing is currently disabled.
+It will either be restored or entirely removed at some point. See task-3454790.
     run: "click",
 }, {
     content: "Switch from desktop to mobile preview",
@@ -43,4 +46,5 @@ registry.category("web_tour.tours").add("website_theme_preview", {
     content: "Check that the desktop view is active",
     trigger: ".o_view_form_theme_preview_controller .o_field_iframe > div:not(.is_mobile):visible",
     run: () => null, // it's a check
+*/
 }]});