Revert "add plain text link to email address confirmation emails"

This reverts commit 48cd7e604dcc5f3b7ae8eb699f14b44bc073f107.

services/web/app/coffee/Features/Email/EmailBuilder.coffee

@@ -97,8 +97,6 @@ templates.confirmEmail = CTAEmailTemplate({
 	title: () -> "Confirm Email"
 	message: () -> "Please confirm your email on #{settings.appName}."
 	ctaText: () -> "Confirm Email"
-	secondaryMessage: (opts) ->
-		"If the button does not appear, open this link in your browser: #{opts.confirmEmailUrl}"
 	ctaURL: (opts) -> opts.confirmEmailUrl
 })