nixos/testing: Fix graphical tty output

Prior to this commit, the graphical output of an application
running during the boot process was only redirected to the serial
console. Therefore, testing those applications inside the driver (eg.
using `enableOCR = true` was not possible by default.

Limiting the consoles to only the `qemuSerialDevice` has originally been
introduced with fb9f5e4a0322da74201145a3ecbc816525972ab3 to fix journal
output after the activation of both consoles have been introduced with
d4468bedb52bf03ff125d721634f83604bddd589.

However limiting the consoles to only `qemuSerialDevice`this is no longer
necessary since 6aba98aefdc3c6aa22913a042f7519447a684372 makes sure the
journal is always forwarded to the serial console used by the testing
driver.

This is a follow-up on https://github.com/NixOS/nixpkgs/pull/339730

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