Avoid embedding web-worker polyfill

The BLOB code from web-worker is minified, and contains source maps that are then
passed over by webpack - that creates a situation of minified code inside BLOB
inside minified code which confuses some tools, eg.

jantimon/chrome-profile-sourcemap-resolver#4

That could be fixed, but the only reason to do so would be supporting very old
(pre-2013) browsers, so we are better off removing the polyfill altogether.

Signed-off-by: Silvio Moioli <silvio@moioli.net>

shell/vue.config.js

@@ -120,11 +120,11 @@ const getLoaders = (SHELL_ABS) => {
   }
 
   return [
-    // Ensure there is a fallback for browsers that don't support web workers
+    // no fallback for pre-2013 browsers https://caniuse.com/webworkers
     {
       test:    /web-worker.[a-z-]+.js/i,
       loader:  'worker-loader',
-      options: { inline: 'fallback' },
+      options: { inline: 'no-fallback' },
     },
     // Handler for csv files (e.g. ec2 instance data)
     {