fix: filter out 'this' binding for foreign namespace

src/compiler/compile/nodes/Element.ts

@@ -599,12 +599,14 @@ export default class Element extends Node {
 	}
 
 	validate_bindings_foreign() {
-		this.bindings.forEach(binding => {
+		this.bindings
-			this.component.error(binding, {
+			.filter(binding => binding.name !== 'this')
-				code: 'invalid-binding',
+			.forEach(binding => {
-				message: `'${binding.name}' is not a valid binding. Foreign elements only support bind:this`
+				this.component.error(binding, {
+					code: 'invalid-binding',
+					message: `'${binding.name}' is not a valid binding. Foreign elements only support bind:this`
+				});
 			});
-		});
 	}
 
 	validate_bindings() {