editors/emacs-devel: Update to fix build when pgtk knob is off

The 2022-07-31 update to 3d6af11 introduced a bug that caused the build
to fail when the port's pgtk knob was off.

cc -o temacs.tmp ...

ld: error: undefined symbol: x_scroll_bar_redraw >>> referenced
by xterm.c >>> xterm.o:(XTset_vertical_scroll_bar)

This update includes an upstream fix.

Changes: https://github.com/emacs-mirror/emacs/compare/11e6c12...261d6af

Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D36034