Bug 35643: Upgrade HC Sticky library from v2.2.3 to v2.2.7

Bug 35643: Upgrade HC Sticky library from v2.2.3 to v2.2.7

This patch upgrades the HC Sticky library in the OPAC and staff
interface to the latest version, 2.2.7. The file is moved to its own
directory for consistency's sake.

To test, apply the patch and clear your browser cache if ncessary.

Test pages in the OPAC and staff interface which use the "sticky"
heading feature. As you scroll down the header should "stick" to the top
of the viewport. For example:

- Administration -> System preferences
- Catalog -> Search results
- Cataloging -> Basic MARC editor
- Patrons -> Add or edit patron
- Lists -> List contents

In the OPAC:

- Catalog search results
- Lists -> List contents

Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>