bug#67325: shorthands: Incorrect autoloaded register-definition-prefixes

[Joseph Turner]

When using shorthands.el, autoload generation inserts a call to
register-definition-prefixes with the shorthand prefix, instead of the
translated print name prefix.  For example, breadcrumb-autoloads.el
contains the line:

(register-definition-prefixes "breadcrumb" '("bc-"))

instead of

(register-definition-prefixes "breadcrumb" '("breadcrumb-"))

This PR attempts to resolve this issue in breadcrumb.el by adding the
correct autoload line at the bottom of the file:

https://github.com/joaotavora/breadcrumb/pull/24

What needs to be done in core Emacs to fix autoload generation with
shorthands.el?

Also see bug#63480.

Thanks!

Joseph