Fixes some issues with LoginSiteAddressViewController.swift.

WordPressAuthenticator/Signin/LoginSiteAddressViewController.swift

@@ -143,12 +143,16 @@ class LoginSiteAddressViewController: LoginViewController, NUXKeyboardResponder
         view.endEditing(true)
         displayError(message: "")
 
-        let siteAddress = WordPressAuthenticator.baseSiteURL(string: loginFields.siteAddress)
+        // We need to to this here because before this point we need the URL to be pre-validated
+        // exactly as the user inputs it, and after this point we need the URL to be the base site URL.
+        // This isn't really great, but it's the only sane solution I could come up with given the current
+        // architecture of this pod.
+        loginFields.siteAddress = WordPressAuthenticator.baseSiteURL(string: loginFields.siteAddress)
 
         configureViewLoading(true)
 
         let facade = WordPressXMLRPCAPIFacade()
-        facade.guessXMLRPCURL(forSite: siteAddress, success: { [weak self] (url) in
+        facade.guessXMLRPCURL(forSite: loginFields.siteAddress, success: { [weak self] (url) in
             // Success! We now know that we have a valid XML-RPC endpoint.
             // At this point, we do NOT know if this is a WP.com site or a self-hosted site.
             if let url = url {