Bug 25350: Load Emoji picker assets more efficiently

Bug 25350: Load Emoji picker assets more efficiently

This patch moves the Emoji picker JS assets out of opac-bottom.inc and
into opac-detail.tt. This prevents the assets from being loaded on every
page of the OPAC when they're only used on opac-detail.

The patch also combines and minifies the 4 JavaScript files used by the
feature. opac-detail.tt now loads only the one file.

To test, apply the patch and make sure the TagsEnabled and
TagsInputOnDetail preferences are enabled.

- Log in to the OPAC and view the detail page for a bibliographic
  record.
- Click the "Add tag(s)" link
- Verify that the emoji-picker works for adding emojis

Signed-off-by: David Roberts <david@koha-ptfs.co.uk>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>