3.31.91: don't show "Show Details" in app menu without gnome software

New implementation of "app menu" has "Show Details" item which points to Gnome Software even when I have not Gnome Software installed.

Exact procedure:

1. I am starting gnome shell while gnome software is not installed. GS shows me "Show details" item in app menu but it does not work (gnome software not installed).
2. I am installing gnome-software. After I started it, GS still shows me "Show details" item in app menu and it works (opens gnome software).
3. I am uninstalling gnome software and killing its instance. GS hides "Show details" from app menu but only until next relogin (restart of GS).

I have installed gnome-shell-dev, mutter-dev and gsettings-desktop-schema-dev from Arch Linux's AUR. https://aur.archlinux.org/packages/gnome-shell-dev/.