Bug 16072: Changing all instances of 'loading-small.gif' to 'spinner-small.gif' and...

Bug 16072: Changing all instances of 'loading-small.gif' to 'spinner-small.gif' and removing loading-small.gif file.

Confirm that I have not missed any places where there is 'loading-small.gif'
Have amended patch to not include OPAC changes from previous patch.

Sponsored-by: Catalyst IT
Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>