Bug 15888 - Syndetics Reviews preference should not enable LibraryThing reviews

 Bug 15888 - Syndetics Reviews preference should not enable LibraryThing reviews

To test:
1 - Enable Syndetics Reviews without a LibraryThing ID
2 - Check page source and note you have a stanza for LTFL tabbed reveiws
3 - Apply patch
4 - Reload page and note LTFL tabbed reviews are not present
5 - Enter a LibraryThing ID and not the tab is restored.

Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Brendan A Gallagher <brendan@bywatersolutions.com>