fix `color-scheme`

Signed-off-by: WaitSpring <me@waitspring.com>

resources/ext.DarkMode.less

@@ -22,10 +22,6 @@
 }
 
 @media screen {
-	:root {
-		color-scheme: light dark;
-	}
-
 	html {
 		color-scheme: only light;
 		height: 100%;