Bug 20686: OPAC shows 'Login to OverDrive account' with 'OverDriveCirculation' syspre...

Bug 20686: OPAC shows 'Login to OverDrive account' with 'OverDriveCirculation' syspref disabled

ps: you will need an active and working overdrive account to test this patch

1/ prepare a koha with overdrive sysprefs set and working
    (OverDriveLibraryID,OverDriveClientKey,OverDriveClientSecret)

2/ set OverDriveCirculation syspref to 'disable'

3/ do an opac search, note the 'Login to OverDrive account' message is incorrectly displayed
    see pic 1

4/ apply patch

5/ do an opac search, note the 'Login to OverDrive account' message is no longer displayed (good)
    see pic 2

Can confirm that bug is replicable and patch applies and functions as described.
Signed-off-by: Dilan Johnpullé <dilan@calyx.net.au>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>