Probably fix bad URI construction for Diffusion symbols

Summary: Ref T9532.

Test Plan: I don't have this configured locally but this seems very likely to be the correct fix. This list should be a list of PHIDs, but is a list of PHIDs followed by one PhabricatorRepository object.

Reviewers: avivey, chad

Reviewed By: chad

Maniphest Tasks: T9532

Differential Revision: https://secure.phabricator.com/D14311

src/applications/diffusion/controller/DiffusionBrowseFileController.php

@@ -288,7 +288,7 @@ final class DiffusionBrowseFileController extends DiffusionBrowseController {
 
       $repo = $drequest->getRepository();
       $symbol_repos = nonempty($repo->getSymbolSources(), array());
-      $symbol_repos[] = $repo;
+      $symbol_repos[] = $repo->getPHID();
 
       $lang = last(explode('.', $drequest->getPath()));
       $repo_languages = $repo->getSymbolLanguages();