fix(tools): generate pre-linted element files

Author: bennypowers

tools/create-element/templates/element/element.ts

@@ -1,5 +1,5 @@
 import { LitElement, html } from 'lit';
-import { customElement } from 'lit/decorators.js';
+import { customElement } from 'lit/decorators/custom-element.js';
 
 import styles from '<%= cssRelativePath %>';