Change desktopManager.gnome3 to desktopManager.gnome

services.xserver.desktopManager.gnome3.enable -> services.xserver.desktopManager.gnome.enable

The former is a deprecated name.

Created by  awesomearvinder  on June 11, 2021
DQI5AYP6Y6R7RJZV3FMSLGTBADXTKN7ZMH7C55EEBWRG5E6T22UQC
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