[REF] *: remove owl from linter's accepted global variables

Before this commit, owl was in the linter's accepted global variables.
This allowed  direct access to owl global object.

For instance, to use xml from owl, you could do :
`const { xml } = owl;`
or you could use it directly:
`owl.xml`

Now, owl is not accepted on linter's global variables anymore, so to
import xml, now you need to use a proper import:

`import { xml } from "@odoo/owl";`

task-id 3498859

closes odoo/design-themes#709

Related: odoo/odoo#137517
Related: odoo/enterprise#48364
Signed-off-by: Samuel Degueldre (sad) <sad@odoo.com>

test_themes/static/src/systray_items/website_switcher.js

@@ -3,8 +3,7 @@
 import { patch } from "@web/core/utils/patch";
 import { useService } from '@web/core/utils/hooks';
 import { WebsiteSwitcherSystray } from '@website/systray_items/website_switcher';
-
-const { onMounted, useState } = owl;
+import { onMounted, useState } from "@odoo/owl";
 
 patch(WebsiteSwitcherSystray.prototype, {
     setup() {