Bug 16507: Show play media tab first if record has no holdings

Bug 16507: Show play media tab first if record has no holdings

To test:
1) Go to Admin -> Global sysprefs
2) Turn on HTML5MediaEnabled and HTML5MediaYouTube
3) Go to Cataloging and create a new record
4) Catalogue a YouTube link in 856$u and save record. Do not add any items (click Normal tab)
5) Confirm that Play media tab is the selected tab by default
6) View record on OPAC and confirm Play media tab is selected by default
7) Go back to staff client, add an item then go back to Normal tab
8) Confirm that Holdings tab is now selected by default
9) Confirm Holdings tab is selected by default on OPAC

Sponsored-by: Catalyst IT
Signed-off-by: Claire Gravely <c.gravely@arts.ac.uk>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>