Update B2C ROPC integration test to verify Id Token is returned

Author: sgonzalezMSFT

src/integrationtest/java/com.microsoft.aad.msal4j/UsernamePasswordIT.java

@@ -137,8 +137,7 @@ public void acquireTokenWithUsernamePassword_B2C_CustomAuthority() throws Except
 
         Assert.assertNotNull(result);
         Assert.assertNotNull(result.accessToken());
-        // TODO uncomment once service fixes this for ROPC flow
-        // Assert.assertNotNull(result.idToken());
+        Assert.assertNotNull(result.idToken());
     }
 
     @Test
@@ -164,7 +163,6 @@ public void acquireTokenWithUsernamePassword_B2C_LoginMicrosoftOnline() throws E
 
         Assert.assertNotNull(result);
         Assert.assertNotNull(result.accessToken());
-        // TODO uncomment once service fixes this for ROPC flow
-        // Assert.assertNotNull(result.idToken());
+        Assert.assertNotNull(result.idToken());
     }
 }