accounts: Show "contact through" cog when only email is given"

one portion of #233: When adding an email address to an account, the
admin (for now) will manually have to enable its use by clicking the cog icon and
enabling "contact through email". Only for now, currently some other
unfinished work is stopping me from committing the other portion of code
for this issue.

router.go

@@ -192,6 +192,8 @@ func (app *appContext) loadRoutes(router *gin.Engine) {
 			api.GET(p+"/telegram/pin", app.TelegramGetPin)
 			api.GET(p+"/telegram/verified/:pin", app.TelegramVerified)
 			api.POST(p+"/users/telegram", app.TelegramAddUser)
+		}
+		if emailEnabled {
 			api.POST(p+"/users/contact", app.SetContactMethods)
 		}
 		if discordEnabled {