[FIX] theme_*: fix breadcrumb color

*: anelusia, anelusia, enark, kiddo, loftspace, notes

- Install Website e-commerce.
- Select the "Kea" theme for your website.
- Go to the "/shop" page.
- Click on "Desks" category to go to the "/shop/category/desks-1" page.
- Click on edit to enter edit mode.
- Click on the "theme" tab.
- Change the website background color to "black".
- Bug: The breadcrumb has an ugly white background instead of no
background color, as in the "default" theme. Also, the "active"
breadcrumb item is hidden due to white text on a white background.

This commit removes the white background from the breadcrumb for all
themes that use it. This ensures the same appearance as other themes.

opw-4232082

closes odoo/design-themes#1017

X-original-commit: fe91239586
Signed-off-by: Serge Bayet (seba) <seba@odoo.com>

theme_notes/static/src/scss/bootstrap_overridden.scss

@@ -4,10 +4,6 @@ $box-shadow-sm:               0 0 .3125rem rgba(0,0,0,.25) !default;
 $box-shadow:                  0 0 .3125rem rgba(0,0,0,.25) !default;
 $box-shadow-lg:               0 0 .3125rem rgba(0,0,0,.25) !default;
 
-// Breadcrumbs
-
-$breadcrumb-bg:                     o-color('white') !default;
-
 // Headings font weight
 
 $headings-font-weight: $o-theme-headings-font-weight !default;