trailing newline fixes for prettier

Author: a-stewart

dev/vscode-button-group.html

@@ -44,4 +44,4 @@ <h2>Basic example</h2>
       </vscode-demo>
     </main>
   </body>
-</html>
+</html>

src/vscode-button/vscode-button.styles.ts

@@ -154,4 +154,4 @@ const styles: CSSResultGroup = [
   `,
 ];
 
-export default styles;
+export default styles;