chore: remove color-scheme property from body (#9598)

Author: DiegoCardoso

dev/common.js

@@ -4,10 +4,6 @@ import { addGlobalThemeStyles } from '@vaadin/vaadin-themable-mixin/register-sty
 addGlobalThemeStyles(
   'dev-common',
   css`
-    html {
-      color-scheme: light dark;
-    }
-
     body {
       font-family: system-ui, sans-serif;
       line-height: 1.25;