VB6 Code Explorer does not show correct startup project

[mansellan]

Rubberduck version information
Version 2.4.1.4627
OS: Microsoft Windows NT 6.2.9200.0, x64
Host Product: Visual Basic x86
Host Version: 6.00.8176
Host Executable: VB6.EXE

Description
The Code Explorer in VB6 is supposed to show the startup project in bold, but this does not appear to be happening. IIRC it used to, so this may be a regression.

In the above screenshot, the PE correctly shows Project2 in bold as it is the startup project, but the Code Explorer does not.

To Reproduce
Steps to reproduce the behavior:

1. Add multiple projects
2. Set a different startup project

Expected behavior
Bolded node should change to reflect the new startup project.