Bug 23396: Add keyboard_shortcuts.sql to C4/Installer.pm

Bug 23396: Add keyboard_shortcuts.sql to C4/Installer.pm

To test:
1 - Back up your DB if you want to save it
2 - sudo koha-mysql kohadev
    DROP database koha_kohadev;
    CREATE database koha_kohadev;
3 - http://localhost:8081
4 - Go through the web installer
5 - Enable AdvancedCatalogingEditor
6 - Try to load it, fails with JS console error: insert_copyright is not defined
7 - Apply patch
8 - Repeat
9 - This time editor loads

Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>