Fix issues importing some plugins in Next SSR

[paulboocock]

Describe the bug
Some plugins create alias' for global objects, such as navigator or window. This is an issue when importing the plugin in a server environment as those globals don't exist.

To Reproduce

import { GeolocationPlugin } from '@snowplow/browser-plugin-geolocation';

const MyApp = ({ Component, pageProps }) => {
  useSnowplow('sp', 'https://...', { appId: 'test123', plugins: [GeolocationPlugin(true)] });

Expected behavior
import should work fine, outside of useEffect.