simplify code

[penelopeysm]

DynamicPPL.jl/ext/DynamicPPLMCMCChainsExt.jl

Lines 111 to 113 in cca6402

	vi = DynamicPPL.OnlyAccsVarInfo((DynamicPPL.RawValueAccumulator(true),))
	_, vi = DynamicPPL.init!!(model, vi, DynamicPPL.InitFromPrior(), DynamicPPL.UnlinkAll())
	template_vnt = DynamicPPL.get_raw_values(vi)

can just be rand(model)

[penelopeysm]

I'm wrong about that, because rand(model) doesn't include := statements which might also have template info. Boo.