two bug fixes in fit.py - addNoise in vmapFit and truncnorm prior

Fix indentation error in vmapFit. Previously, addNoise was essentially
always set to be True because of a missed indent after if(addNoise).

Fix truncnorm prior definition in getPriorFuncs - sign error swapped
truncation range so it probably returned lnp=-inf for all reasonable
values. Bug noticed from runtime warning about invalid value in log.