Use an https callback for OIDC once again. (#3461)

* Use the new WAS callback type and return back to the https callback for OIDC.

* Simplify OIDCAuthenticationPresenter now it doesn't need to handle universal links.

* Remove old unit tests.

ElementX/Sources/Screens/Settings/AccountSettings/OIDCAccountSettingsPresenter.swift

@@ -28,7 +28,7 @@ class OIDCAccountSettingsPresenter: NSObject {
     
     /// Presents a web authentication session for the supplied data.
     func start() {
-        let session = ASWebAuthenticationSession(url: accountURL, callbackURLScheme: oidcRedirectURL.scheme) { _, _ in }
+        let session = ASWebAuthenticationSession(url: accountURL, callback: .oidcRedirectURL(oidcRedirectURL)) { _, _ in }
         session.prefersEphemeralWebBrowserSession = false
         session.presentationContextProvider = self
         session.start()