Revert "Minify and beautify debug builds to support handling escaping…

… </script> tags in html comment blocks. See #787."

This reverts commit cb2e957

js/grunt/buildRunnable.js

@@ -90,9 +90,7 @@ module.exports = async function( repo, minifyOptions, instrument, allHTML, brand
     stripAssertions: false,
     stripLogging: false
   } : {
-    minify: true,
-    beautify: true,
-    mangle: false
+    minify: false
   };
 
   const usedModules = webpackResult.usedModules;