fix(sc-rounded-input-style): restore usage inside custom elements

Author: The-Clockmaker

sc-rounded-input-style.html

@@ -1,7 +1,8 @@
 <dom-module id="sc-rounded-input-style">
 	<template>
 		<style>
-			html {
+			html,
+			:host > * {
 				--sc-rounded-input: {
 					height: 37px;
 					background: white;