Bug#518011: evince: crashes when overwritng a read-only file

[Francesco Potorti`]

I discovered that I had a 2.22.2 evince still running.  I closed it and
reinstalled everything.  I still get the same dbus warning as before.  I
tried reading a pdf file and saving it overwriting a differnet 444 mode
pdf file and I got correct results: a warning dialog and no crash.

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