Fix bad variable causing aphlict to fail to start with no "logs" config

Summary: Fixes T10863. See that task for discussion.

Test Plan:
  - Configured `aphlict` with no "logs".
  - Started `aphlict`.
    - Before change: exception.
    - After change: worked.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T10863

Differential Revision: https://secure.phabricator.com/D15788

src/applications/aphlict/management/PhabricatorAphlictManagementWorkflow.php

@@ -274,7 +274,7 @@ abstract class PhabricatorAphlictManagementWorkflow
 
     $pid_path = $this->getPIDPath();
     try {
-      $dir = dirname($path);
+      $dir = dirname($pid_path);
       if (!Filesystem::pathExists($dir)) {
         Filesystem::createDirectory($dir, 0755, true);
       }