Gtag fix

[OlegMoshkovich]

Replace deleted arguments in gtag method.

[pablo-mayrgundter]

Rad. Could you also include a unit test? In gtag.test.js something like:

test('gtag', () => {
  let args = null
  window.dataLayer = {
    push: (a) => {
      args = a
    }
  }
  gtag('a', 'b')
  expect(args).toBe(['a', 'b'])
})

[OlegMoshkovich]

@pablo-mayrgundter PTAL