[Bug] Constants.LoginHint should value login_hint, not loginHint (and domain_hint for DomainHint)

[jmprieur]

Which version of Microsoft Identity Web are you using?
1.3.0

Where is the issue?

• Web app
  • [ x ] Sign-in users
  • [ x ] Sign-in users and call web APIs

Repro

Call AccountController.Challenge with a loginHint.

var your = (code) => here;

Expected behavior
The call to AAD should show login_hint

Actual behavior
It's not

Possible solution
Change the value of the LoginHint to login_hint

microsoft-identity-web/src/Microsoft.Identity.Web/Constants/Constants.cs

Line 15 in a4bde02

public const string LoginHint = "loginHint";

Same for DomainHint which should value domain_hint

Additional context / logs / screenshots
Add any other context about the problem here, such as logs and screenshots.

[jmprieur]

@jennyf19 do you agree?
See also https://github.com/AzureAD/azure-activedirectory-identitymodel-extensions-for-dotnet/blob/6e7a53e241e4566998d3bf365f03acd0da699a31/src/Microsoft.IdentityModel.Protocols.OpenIdConnect/OpenIdConnectParameterNames.cs#L55

[jennyf19]

Included in 1.4 Release.