Removing dead code part 2 (#2235)

Co-authored-by: Doug <6060466+pixlwave@users.noreply.github.com>

ElementX/Sources/Application/AppSettings.swift

@@ -144,7 +144,7 @@ final class AppSettings {
     /// Any pre-defined static client registrations for OIDC issuers.
     let oidcStaticRegistrations: [URL: String] = ["https://id.thirdroom.io/realms/thirdroom": "elementx"]
     /// The redirect URL used for OIDC.
-    let oidcRedirectURL: URL = "io.element:/callback"
+    let oidcRedirectURL = URL(string: "\(InfoPlistReader.main.appScheme):/callback")!
 
     /// The date that the call to `/login` completed successfully. This is used to put
     /// a hard wall on the history of encrypted messages until we have key backup.