Probably fix Diviner atom collisions

Ref T8618. I think this was just typoed in D13070.

Immediate issue is that we're looking for symbols with the book name as a "phid".

Auditors: joshuaspence

src/applications/diviner/publisher/DivinerLivePublisher.php

@@ -50,7 +50,7 @@ final class DivinerLivePublisher extends DivinerPublisher {
   private function loadSymbolForAtom(DivinerAtom $atom) {
     $symbol = id(new DivinerAtomQuery())
       ->setViewer(PhabricatorUser::getOmnipotentUser())
-      ->withBookPHIDs(array($atom->getBook()))
+      ->withBookPHIDs(array($this->getBook()->getPHID()))
       ->withTypes(array($atom->getType()))
       ->withNames(array($atom->getName()))
       ->withContexts(array($atom->getContext()))