service: Allow opening corrupt GVDB files when writing

If a GVDB file cannot be opened due to being corrupt, move it out of the
way, warn, and open a new blank database instead.

This prevents the situation where a corrupt database stops the entire
desktop session from loading.

Note that the dconf_gvdb_utils_read_file() code path is only taken
inside DConfWriter. The DConf engine sources (such as
dconf-engine-source-system.c) open the GVDB tables separately, and
already all handle errors gracefully.

Signed-off-by: Philip Withnall <withnall@endlessm.com>

https://gitlab.gnome.org/GNOME/glib/issues/1454

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