Custom OAuth fixes for Reddit (#2921)

* Fix typo with @tokenSentVia in Custom OAuth

* Make custom OAuth work with Reddit

packages/rocketchat-custom-oauth/custom_oauth_server.coffee

@@ -55,6 +55,7 @@ class CustomOAuth
 		response = undefined
 		try
 			response = HTTP.post @tokenPath,
+				auth: config.clientId + ':' + OAuth.openSecret(config.secret)
 				headers:
 					Accept: 'application/json'
 					'User-Agent': @userAgent
@@ -107,6 +108,10 @@ class CustomOAuth
 
 			identity = self.getIdentity accessToken
 
+			# Fix for Reddit
+			if identity?.result
+				identity = identity.result
+
 			# Fix WordPress-like identities having 'ID' instead of 'id'
 			if identity?.ID and not identity.id
 				identity.id = identity.ID