Recent changes incorrectly calculate font size within daemon mode

[Yuri D'Elia]

I've updated my current emacs build to discover a new quirk:

- if I start emacs normally, all is good
- if I start it through emacsclient -c, the screen DPI is not correctly
  calculated. It looks like my fontconfig/Xres DPI settings are ignored.

This change must have been introduced in one of the commits in master in
the last week at most, however I don't see anything pointing to
fontconfig/daemon mode changes.

Before I dig into it, any possible explanation?