The RefreshTokenProducer is null

**Describe the bug**
When trying to recreate the client from a token stored in a file, i get the following error: ```kt
com.adamratzman.spotify.SpotifyException$ReAuthenticationNeededException: Re-authentication is needed.
	at com.adamratzman.spotify.SpotifyApi.refreshToken(SpotifyApi.kt:221)
	at com.adamratzman.spotify.http.HttpRequest.execute(HttpRequest.kt:146)
	at com.adamratzman.spotify.http.HttpRequest$execute$1.invokeSuspend(HttpRequest.kt)
	at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
	at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:104)
	at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:584)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:811)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:715)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:702)
Caused by: java.lang.IllegalStateException: The refreshTokenProducer is null.
	... 9 more```

**To Reproduce**
load a token via ```kt
authorization = SpotifyUserAuthorization(
    tokenString = config!!.auth.token,
    refreshTokenString = config!!.auth.refreshToken
)```

**Expected behavior**
refreshTokenProducer to be prefilled


**Desktop (please complete the following information):**
 - OS: Windows 11


Provide feedback

Saved searches

Use saved searches to filter your results more quickly

Uh oh!