monitor: Show notification always when device is unmounted
monitor: Show notification always when device is unmounted

Unmount progress is shown only when unmount takes more then 1.5 seconds.
However the progress should be shown everytime when unmount is finished
for users to be sure it is safe to remove device.

https://bugzilla.gnome.org/show_bug.cgi?id=750267

gicmo/gvfs,gicmo/gvfs,gicmo/gvfs,gicmo/gvfs