[FIX] portal: Make .text-muted inside colored sections work

This was working fine previously in v11.

Now in v12 it stopped working because Bootstrap 4 adds `!important` to `.text-muted`.

Adding `!important` makes these styles useful again.

closes odoo/odoo#35011

Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>

addons/portal/static/src/scss/portal.scss

@@ -271,14 +271,14 @@ img.o_we_custom_image {
     background-color: #169C78;
     color: white;
     .text-muted {
-        color: #ddd;
+        color: #ddd !important;
     }
 }
 .oe_blue_light {
     background-color: #41b6ab;
     color: white;
     .text-muted {
-        color: #ddd;
+        color: #ddd !important;
     }
 }
 .oe_blue {
@@ -289,21 +289,21 @@ img.o_we_custom_image {
     background-color: #f05442;
     color: white;
     .text-muted {
-        color: #ddd;
+        color: #ddd !important;
     }
 }
 .oe_purple {
     background-color: #b163a3;
     color: white;
     .text-muted {
-        color: #ddd;
+        color: #ddd !important;
     }
 }
 .oe_red {
     background-color: #9C1b31;
     color: white;
     .text-muted {
-        color: #ddd;
+        color: #ddd !important;
     }
 }
 .oe_none {