Remove default scheme, fix username/password login

[VMelnalksnis]

Could resolve #428, worked locally but will have to deploy a nightly release to confirm.

Also fixes an issue with Login page, which still used email as the username.

[codecov]

Codecov Report

Merging #702 (f3bc3d5) into master (b48e70e) will decrease coverage by 0.95%.
The diff coverage is 34.81%.

@@            Coverage Diff             @@
##           master     #702      +/-   ##
==========================================
- Coverage   73.32%   72.38%   -0.95%     
==========================================
  Files         212      218       +6     
  Lines        6134     6275     +141     
  Branches      359      407      +48     
==========================================
+ Hits         4498     4542      +44     
- Misses       1477     1566      +89     
- Partials      159      167       +8     

Impacted Files	Coverage Δ
...eas/Identity/Pages/Account/ExternalLogin.cshtml.cs	13.46% <0.00%> (ø)
...i/Areas/Identity/Pages/Account/LoginWith2Fa.cshtml	0.00% <0.00%> (ø)
...dentity/Pages/Account/LoginWithRecoveryCode.cshtml	0.00% <0.00%> (ø)
...pi/Areas/Identity/Pages/Account/Register.cshtml.cs	27.27% <0.00%> (ø)
...hade.WebApi/V1/Controllers/OwnershipsController.cs	68.00% <0.00%> (ø)
...reas/Identity/Pages/Account/LoginWith2Fa.cshtml.cs	28.20% <28.20%> (ø)
...tity/Pages/Account/LoginWithRecoveryCode.cshtml.cs	31.42% <31.42%> (ø)
...ebApi/Areas/Identity/Pages/Account/Login.cshtml.cs	37.14% <37.14%> (ø)
...e.WebApi/Areas/Identity/Pages/Account/Login.cshtml	70.58% <70.58%> (ø)
...omeshade.WebApi/Configuration/AuthConfiguration.cs	91.73% <75.00%> (-0.20%)	⬇️
... and 2 more

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