conf: fix loading of default values

previously, default values were stored once into a static struct,
then on each reload item by item copied manually into a "new"
config struct.
this has proven to be errorprone, as additions in one of the 2
locations were not propagated to the second one, apart from
being simply a lot of gratuitous code.

we now simply load the default values directly into the config
struct to be used on each reload.

closes #283

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