Arnaud Ferraris authored Apr 15, 2022 and Marge Bot committed May 12, 2022

As `phoc` is now able to automatically compute the scaling factor based
on the output's physical size, we no longer need to set this value in
the default config: `DSI` output should return a correct physical size,
while `X11` and `WL` outputs advertise a 0x0 mm size, leading phoc to
fall back to the default scale value (`1`).

Part-of: <!1062>