Use intelligent /user/trial v2 URL for v2 trials

services/web/app/views/layout.pug

@@ -98,7 +98,8 @@ html(itemscope, itemtype='http://schema.org/Product')
 
 		- if (settings.overleaf && settings.overleaf.useOLFreeTrial)
 			script.
-				window.redirectToOLFreeTrialUrl = '!{settings.overleaf.host}/users/trial'
+				window.useV2TrialUrl = true
+
 
 	body
 		if(settings.recaptcha)

services/web/public/coffee/main/account-upgrade.coffee

@@ -11,8 +11,8 @@ define [
 			w = window.open()
 			go = () ->
 				ga?('send', 'event', 'subscription-funnel', 'upgraded-free-trial', source)
-				if window.redirectToOLFreeTrialUrl?
-					url = window.redirectToOLFreeTrialUrl
+				if window.useV2TrialUrl
+					url = "/user/trial"
 				else
 					url = "/user/subscription/new?planCode=#{plan}&ssp=true"
 					if couponCode?