set-project-parent --children-of: Fix getting parent for level 1 projects

For direct child projects of the 'All-Projects' project the name of the
parent project was incorrectly retrieved if the parent name was not
explicitly stored as 'All-Projects' in the project.config file.

Change-Id: Ic9aab7f96c04bac21778f8c93bc5cb5056161ced
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>

gerrit-sshd/src/main/java/com/google/gerrit/sshd/commands/AdminSetParent.java

@@ -223,7 +223,7 @@ final class AdminSetParent extends SshCommand {
         continue;
       }
 
-      if (parentName.equals(e.getProject().getParent(projectName))) {
+      if (parentName.equals(e.getProject().getParent(allProjectsName))) {
         childProjects.add(e.getProject());
       }
     }