Fix starred favourite icon

Signed-off-by: John Molakvoæ (skjnldsv) <skjnldsv@protonmail.com>

Author: skjnldsv

apps/files/css/files.css

@@ -874,7 +874,7 @@ table.dragshadow td.size {
 		background-image: none;
 	}
 	& .icon-starred {
-		@include icon-color('star-dark', 'actions', variables.$color-yellow, 1, true);
+		background-image: var(--icon-starred-yellow) !important;
 	}
 }