GUACAMOLE-773: Restore missing static template/layout files.

The on-screen keyboard layouts and AngularJS templates were previously
part of the Java webapp build, but are now part of the NPM/Webpack
build. Those files were incorrectly left out of the Webpack config,
causing the on-screen keyboard and automatic display resize to fail.

Display of the on-screen keyboard fails without these files as it relies
on loading the on-screen keyboard layouts dynamically via HTTP. Handling
of automatic display resize fails because this relies on a hidden
<object> element containing a blank HTML document, with that document
served statically over HTTP.

guacamole/src/main/frontend/webpack.config.js

@@ -117,8 +117,10 @@ module.exports = {
 
         // Copy static files to dist/
         new CopyPlugin([
+            { from: 'app/**/*' },
             { from: 'fonts/**/*' },
             { from: 'images/**/*' },
+            { from: 'layouts/**/*' },
             { from: 'translations/**/*' }
         ], {
             context: 'src/'