update private enum value of 1 to an official MSALPreferredAuthMethodQRPIN

Author: mipetriu

MSAL/src/MSALDeviceInformation.m

@@ -128,7 +128,7 @@ - (MSALPreferredAuthMethod)msalPreferredAuthMethodFromMSIDPreferredAuthMethod:(M
 {
     switch (msidPreferredAuthConfig) {
         case MSIDPreferredAuthMethodQRPIN:
-            return 1; // Private enum value for QR+PIN
+            return MSALPreferredAuthMethodQRPIN;
 
         default:
             return MSALPreferredAuthMethodNone;

MSAL/src/MSALPublicClientApplication.m

@@ -1040,8 +1040,8 @@ - (void)acquireTokenWithParameters:(MSALInteractiveTokenParameters *)parameters
     // Extra parameters to be added to the /authorize endpoint.
     msidParams.extraAuthorizeURLQueryParameters = self.internalConfig.extraQueryParameters.extraAuthorizeURLQueryParameters;
 
-    // Private enum value for QR+PIN
-    if (parameters.preferredAuthMethod == 1)
+    // Setup QR+PIN accelerated experience if configured
+    if (parameters.preferredAuthMethod == MSALPreferredAuthMethodQRPIN)
     {
         NSMutableDictionary *extraAuthorizeURLQueryParameters = [msidParams.extraAuthorizeURLQueryParameters mutableCopy];
         [extraAuthorizeURLQueryParameters setObject:MSID_PREFERRED_AUTH_METHOD_QR_PIN forKey:MSID_PREFERRED_AUTH_METHOD_KEY];

MSAL/src/public/MSALDefinitions.h

@@ -191,7 +191,11 @@ typedef NS_ENUM(NSUInteger, MSALPreferredAuthMethod)
     /*
         No preferred auth method passed with the request to the authetication server.
     */
-    MSALPreferredAuthMethodNone
+    MSALPreferredAuthMethodNone,
+    /*
+        QR+PIN authentication preferred.
+    */
+    MSALPreferredAuthMethodQRPIN
 };
 
 #if TARGET_OS_OSX