Run Client Credentials Mtls Pop Sni Tests against PROD (#5403)

Update ClientCredentialsMtlsPopTests.cs

Author: gladjohn

tests/Microsoft.Identity.Test.Integration.netcore/HeadlessTests/ClientCredentialsMtlsPopTests.cs

@@ -47,7 +47,6 @@ public async Task Sni_Gets_Pop_Token_Successfully_TestAsync()
             AuthenticationResult authResult = await confidentialApp
                 .AcquireTokenForClient(settings.AppScopes)
                 .WithMtlsProofOfPossession()
-                .WithExtraQueryParameters("dc=ESTSR-PUB-WUS3-AZ1-TEST1&slice=TestSlice") //Feature in test slice 
                 .ExecuteAsync()
                 .ConfigureAwait(false);