Bug 23246: Only jump into the 'images' tab HTML5MediaEnabled is set

Bug 23246: Only jump into the 'images' tab HTML5MediaEnabled is set

This patch makes jumping into the third tab happen only if
HTML5MediaEnabled is set to 'both' or 'staff'.

To test:
- Have HTML5MediaEnabled set to 'opac' or 'not at all'
- Open the detail page of a record with no holdings
=> FAIL: The 'images' tab is selected
- Apply this patch
- Reload
=> SUCCESS: The 'holdings' tab is selected as it should be.
- Sign off :-D

Sponsored-by: America Numismatic Society
Signed-off-by: Maryse Simard <maryse.simard@inlibro.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>