bug#41905: Small change: In Customize, display name with with spaces, but keep symbol name underneath.

[Lars Ingebrigtsen]

ej32u@protonmail.com writes:

> This patch changes custom-unlispify-menu-entry to display symbols
> names with the "display" text property, but to keep the symbol name
> underneath. This is good when using try-expand-dabbrev-all-buffers,
> such as when writing the init file.

Makes sense to me, so I've applied this to Emacs 28.

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