bug#66947: 30.0.50; Implement missing functions for custom-icon widget

[Mauro Aranda <maurooaranda@gmail.com>]

There are some missing functions for the custom-icon widget to actually
work when customizing icons:
:custom-mark-to-save
:custom-reset-current
:custom-reset-saved
:custom-state-set-and-redraw
:custom-reset-standard
:custom-mark-to-reset-standard

I'll send a patch.


In GNU Emacs 30.0.50 (build 60, x86_64-pc-linux-gnu, GTK+ Version
  3.24.33, cairo version 1.16.0) of 2023-11-04 built on tbb-desktop
Repository revision: 5ab5dfd64c85cee8c8d37e988519045e11f46a98
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12201001
System Description: Ubuntu 22.04.3 LTS

Configured features:
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JSON LCMS2 LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 M17N_FLT MODULES NOTIFY
INOTIFY PDUMPER PNG RSVG SECCOMP SOUND SQLITE3 THREADS TIFF
TOOLKIT_SCROLL_BARS TREE_SITTER X11 XDBE XIM XINPUT2 XPM GTK3 ZLIB

Important settings:
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