Bugfixes to Valo (#14490)

valo-component-group mixin doesn’t have any parameters. Ruby compiler
produces an error, but Java compiler works anyway (#14479).

Missing semicolon after a line before @include produces an error with
the Ruby compiler, but passes compilation with the Java compiler
(#14480).

Change-Id: If6fa2b5039f4d9daa7ee73380f089b533c2cce0f