Fixes with-supertokens example

[rishabhpoddar]

This PR fixes how a protected API is called once the user is logged in, in the with-supertokens example app.

[samcx]

@rishabhpoddar Can you further clarify on this in the description (e.g., is it because it's redundant?)?

[rishabhpoddar]

Oh yea, sorry. It is redundant indeed, cause we add interceptors to XHR / fetch which add the access token to the request automatically + manage their refreshing based on the response from the the API.