Update installer.patch against latest tails-installer 5.0.4
Update installer.patch against latest tails-installer 5.0.4

tails-installer is a Python application, currently at version 5.0.4+dfsg.
That version was tagged on January 22nd and uploaded to repositories
(Debian on Feb 3rd and Launchpad PPA on Feb 4th), causing the included
patch in our docs to fail because some lines in gui.py and creator.py
had changed.

This updates the patch in the "virtualizing Tails" documentation. Fixes #3105.

ehartsuyker/securedrop,ehartsuyker/securedrop,conorsch/securedrop,conorsch/securedrop,heartsucker/securedrop,heartsucker/securedrop,ehartsuyker/securedrop,ehartsuyker/securedrop,conorsch/securedrop,ehartsuyker/securedrop,conorsch/securedrop,heartsucker/securedrop,heartsucker/securedrop,ehartsuyker/securedrop,heartsucker/securedrop,conorsch/securedrop