fix: filter out 'this' binding for foreign namespace

src/compiler/compile/nodes/Element.ts

@@ -599,7 +599,9 @@ export default class Element extends Node {
 	}
 
 	validate_bindings_foreign() {
-		this.bindings.forEach(binding => {
+		this.bindings
+			.filter(binding => binding.name !== 'this')
+			.forEach(binding => {
 				this.component.error(binding, {
 					code: 'invalid-binding',
 					message: `'${binding.name}' is not a valid binding. Foreign elements only support bind:this`