Installation banner should take into account the request strategy used

[dwosk]

The two-step banner was designed in mind that the web extension strategy would be used. However, the HTTP strategy can be used by setting connectMethod: 'http'. In this case, the UI should not show "Install Extension" since it is not actually required. We used to have the "blue" banner to handle the HTTP strategy, but we've since removed it from the SDK.

We should update the UI to handle the HTTP strategy properly. This will become more important if/when we make the HTTP strategy the default again and mitigate the need for a web extension since mainstream browsers (mainly Chrome/Firefox) now treat HTTP requests to 127.0.0.1 as secure.