fix webpack prod build setup

webpack.config.production.js

 const { createApp, createExample } = require('./webpack.config.common.js');
 
-const apps = ['viewer'];
 const examples = ['proteopedia-wrapper', 'basic-wrapper', 'lighting'];
 
 module.exports = [
-    ...apps.map(createApp),
+    createApp('viewer', 'molstar'),
     ...examples.map(createExample)
 ]
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