PWAs are being groups with Chrome browser icons in gnome

I've detailed this a bit here https://discussion.fedoraproject.org/t/chrome-pwas-in-gnome-grouping-into-the-same-browser-icon/81714

I've been following the paths between Flextop and Cobalt trying to find a root cause to this issue.

It seems at one point in the past this used to work, but now it doesn't? A fresh PWA installed as `com.google.Chrome.flextop.chrome-cifhbcnohmdccbgoicgdjpfamggdegmo-Profile_1.desktop` which seems to have the correct prefix necessary for to have a specific icon and window to not be grouped.

```
cat com.google.Chrome.flextop.chrome-cifhbcnohmdccbgoicgdjpfamggdegmo-Profile_1.desktop | grep -i Start
StartupWMClass=crx_cifhbcnohmdccbgoicgdjpfamggdegm
```