chore: use withTwitterSignIn() for test and content view

Author: russellwheatley

samples/swiftui/FirebaseSwiftUIExample/FirebaseSwiftUIExample/ContentView.swift

@@ -49,9 +49,10 @@ struct ContentView: View {
     )
     .withGoogleSignIn()
     .withPhoneSignIn()
+    .withTwitterSignIn()
     .withFacebookSignIn()
     .withEmailSignIn()
-    .withTwitterSignIn()
+
   }
 
   var body: some View {

samples/swiftui/FirebaseSwiftUIExample/FirebaseSwiftUIExample/TestView.swift

@@ -56,6 +56,7 @@ struct TestView: View {
     )
     .withGoogleSignIn()
     .withPhoneSignIn()
+    .withTwitterSignIn()
     .withFacebookSignIn()
     .withEmailSignIn()
   }