editors/emacs-devel: Build pure GTK Emacs by default

• Add PGTK to OPTIONS_DEFAULT
• Remove M17N, OTF, XFT, XIM, and XPM from OPTIONS_DEFAULT
• Eliminate X11 dependencies for pure GTK Emacs by
  • removing CAIRO_IMPLIES=XFT and OTF_IMPLIES=XFT
  • adding CAIRO_PREVENTS=XFT and PGTK_PREVENTS=M17N XFT XPM
  • not including USES=xorg.

While here, pull in a new 2022-01-03 revision and incorporate minor
formatting changes suggested by portfmt.

Reported by: jbeich
Reviewed by: jbeich
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D33714