[FIX] Support on-premises WordPress OAuth

[cardoso]

@RocketChat/ios

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (develop@0a8a0e0). Click here to learn what that means.
The diff coverage is 17.94%.

@@            Coverage Diff             @@
##             develop    #2043   +/-   ##
==========================================
  Coverage           ?   36.08%           
==========================================
  Files              ?      375           
  Lines              ?    17497           
  Branches           ?        0           
==========================================
  Hits               ?     6314           
  Misses             ?    11183           
  Partials           ?        0

Impacted Files	Coverage Δ
Rocket.Chat/Models/LoginService.swift	77.96% <ø> (ø)
...t/API/Requests/General/PublicSettingsRequest.swift	81.81% <ø> (ø)
Rocket.Chat/Models/AuthSettings.swift	100% <ø> (ø)
...hat/Controllers/Auth/AuthTableViewController.swift	0% <0%> (ø)
...Chat/Models/Mapping/AuthSettingsModelMapping.swift	98.11% <100%> (ø)
...Chat/Models/Mapping/LoginServiceModelMapping.swift	75.78% <26.31%> (ø)

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