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Disable Fade Inactive Geometry overlay by default

This overlay was intended to identify the active objects in modes
like Sculpt Mode, where you don't have any extra visual indication
of what is the current and target object when switching directly
between them.

After having flash on mode transfer on the transfer mode operator,
the visual information this overlays provides is redundant. It is
still available in case some users want to use it like a way of
focusing on the active object.

Reviewed By: JulienKaspar, JacquesLucke

Differential Revision: https://developer.blender.org/D12303