fix typo, disallow multiple style/script tags

compiler/parse/state/tag.js

@@ -88,7 +88,7 @@ export default function tag ( parser ) {
 	if ( name in specials ) {
 		const special = specials[ name ];
 
-		if ( parser[ special.id ] ) {
+		if ( parser[ special.property ] ) {
 			parser.index = start;
 			parser.error( `You can only have one <${name}> tag per component` );
 		}

test/parser/error-multiple-styles/error.json

@@ -0,0 +1,8 @@
+{
+	"message": "You can only have one <style> tag per component",
+	"loc": {
+		"line": 9,
+		"column": 0
+	},
+	"pos": 58
+}

test/parser/error-multiple-styles/input.html

@@ -0,0 +1,13 @@
+<div>foo</div>
+
+<style>
+	div {
+		color: red;
+	}
+</style>
+
+<style>
+	div {
+		color: blue;
+	}
+</style>