[FIX] web: background of active row should not be grey

**Current behavior before PR:**

When changing the focus with keyboard (keyboard navigation),
the background of the active row is grey, we don't like grey.

**Desired behavior after PR is merged:**

We want the plain old white background.

X-original-commit: bb70c3c289a3b6222bd991f0426c4e5e63359872
Part-of: odoo/odoo#102381

addons/web/static/src/views/list/list_renderer.scss

@@ -150,10 +150,6 @@
         }
 
         .o_keyboard_navigation {
-            tr:focus-within {
-                background-color: lighten($o-form-lightsecondary, 10%);
-            }
-
             th:focus-within, td:focus-within {
                 --table-accent-bg: none;