[housekeeping] Use g_settings_get_mapped, fix paranoid cleanup on shutdown

1. Use g_settings_get_mapped instead of our own hack get_gsettings_int_with_default.

2. Don't force hard-coded default when value is 0, as that's used to allow
paranoid scanning on shutdown.

3. Only unref the settings object at the end of _stop routine, not before
do_cleanup is potentially called, since purge_thumbnail_cache uses the settings.
This was also causing asserts when killing msd, as described in (now closed) #23.

These are regressions introduced by the gsettings port of the plugin -- 03478b4d

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