remove copypaste animation validation from keyblock

src/compiler/compile/nodes/KeyBlock.ts

@@ -1,35 +1,19 @@
 import Expression from "./shared/Expression";
 import map_children from "./shared/map_children";
 import AbstractBlock from "./shared/AbstractBlock";
-import Element from "./Element";
 
 export default class KeyBlock extends AbstractBlock {
 	type: "KeyBlock";
 
 	expression: Expression;
-	has_animation: boolean;
 
 	constructor(component, parent, scope, info) {
 		super(component, parent, scope, info);
 
 		this.expression = new Expression(component, this, scope, info.expression);
 
-		this.has_animation = false;
-
 		this.children = map_children(component, this, scope, info.children);
 
-		if (this.has_animation) {
-			if (this.children.length !== 1) {
-				const child = this.children.find(
-					(child) => !!(child as Element).animation
-				);
-				component.error((child as Element).animation, {
-					code: `invalid-animation`,
-					message: `An element that use the animate directive must be the sole child of a key block`
-				});
-			}
-		}
-
 		this.warn_if_empty_block();
 	}
 }