Exclude more shortcodes in word counter

[ocean90]

Since #27386 shortcodes are ignored in the word counter. But due to the way how shortcodes are passed to JavaScript the counter only ignores shortcodes which are registered before the init hook (or with a lower priority on init).

Attached patch moves the localization into wp_just_in_time_script_localization() to get access to all shortcodes.

[pento]

In 41844:

Editor: Improve the accuracy of the list of shortcodes that the word count ignores.

Previously, shortcodes were being counted when the init action fired, even though it's possible for shortcodes to be registered later than that.

By leaving the counting until just before the script is printed, we get a more accurate list of shortcodes.

Props ocean90.
Fixes #41917.