Mobile Login Link routing

Summary

Reported by OTRS Ticket#20190823609000183 from Rafa Terrero

Steps to reproduce

Use the smartphone view and navigate to any suppage
Click at mobile menu and select login
You will end in a 404

Example URL

https://typo3.org/community/values/code-of-conduct/

What is the current bug behavior?

The user ends in a 404

What is the expected correct behavior?

the requested page in a logged in state

Acceptence Criterias

click at login should route to http://typo3.org/login/