Remove unused environment variable

Author: Ray Schamp

webpack.config.js

@@ -129,7 +129,6 @@ module.exports = [
         },
         plugins: base.plugins.concat([
             new webpack.DefinePlugin({
-                'process.env.API_HOST': '"' + process.env.API_HOST + '"',
                 'process.env.NODE_ENV': '"' + process.env.NODE_ENV + '"',
                 'process.env.DEBUG': Boolean(process.env.DEBUG),
                 'process.env.GA_ID': '"' + (process.env.GA_ID || 'UA-000000-01') + '"'