initfs: switch to VT#3 before `run.d`

* Make `vesad` allocate VTs 1..12 on startup. They can later be replaced
  by another display device.
* Switch to VT#3 before `run.d`
* Also set the mode of VT#3 to [`VtMode::Graphical`].

Signed-off-by: Anhad Singh <andypythonappdeveloper@gmail.com>