message: Fix casing of href on popup.html
diff: @@ -6,7 +6,7 @@ Licensed under the MIT License.
  <html dir="ltr" lang="en">
  <head>
  <link rel="stylesheet" type="text/css" href="../common/styles/fabric.min.css" />
  - <link rel="stylesheet" type="text/css" href="./Styles/default/popup.css" />
  + <link rel="stylesheet" type="text/css" href="./styles/default/popup.css" />
  <title>Accessibility Insights for Web</title>
  <script src="../insights.config.js"></script>
  </head>
  