Review Mozilla 1986534: Disable screenshots in PBM

🔍 Bugzilla Audit

Bugzilla: https://bugzilla.mozilla.org/show_bug.cgi?id=1986534

Description

We use this pref.

The reason to remove it, according to comment 6, is that it's now possible to hide the app in the launcher, without disabling screenshots.

I wonder if that's enough for us.

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