message: fix(UMDExample): revert change to script path
  Incorrectly changed in
diff: <title>itk-wasm UMD Example</title>
  <meta charset="UTF-8" />
  <link rel="stylesheet" href="styles.css">
  - <script src="./itk-wasm.js"></script>
  + <script src="https://cdn.jsdelivr.net/npm/itk-wasm@1.0.0-b.16/dist/umd/itk-wasm.min.js"></script>
  +
  <script src="https://cdn.jsdelivr.net/npm/itk-vtk-viewer@11.12.3/dist/itkVtkViewer.js"></script>
  </head>
  