Update start-env with new NextStartOptions

[mho22]

Related to pull request 2314

Corrected error with port and hostname options and removed no more needed array. Based on Next CLI command file

Before

cli.nextStart({
  '--port': process.env.PORT || 3000,
  '--hostname': process.env.HOSTNAME || '0.0.0.0',
  _: [],
});

After

cli.nextStart({
  'port': process.env.PORT || 3000,
  'hostname': process.env.HOSTNAME || '0.0.0.0'
});

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