The dconf configuration and installation file was needed because the
schemas `sm.puri.phoc.application.org-gnome-maps` and
`sm.puri.phoc.application.firefox` are not schemas that can be overriden.
The actual schema is `sm.puri.phoc.application`, which is a relocatable
schema. Therefore, we could use an override to specify the default,
but with a simple configuration file, gsettings cannot relocate the
schema. Therefore, the dconf configuration makes sense for these kind
of schemas. For regular schemas that can be overriden with an override
file, it is simpler to just use it.
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