gunixmounts: Stop considering cifs/nfs as system file systems

Philip Withnall requested to merge pwithnall/glib:cifs-is-not-a-system-fs into master

They’re network file systems, but not system file systems (in the sense that procfs is a system file system). This fixes them disappearing from the sidebar in the UI.

Signed-off-by: Philip Withnall

#1424 (closed)

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