That seems implausible. Obviously there was evolutionary pressure on northern Europeans to tolerate lower levels of sunlight and no doubt adaption happened. However, I expect even Swedes evolved in an environment that included more time outdoors than a modern Swedish office worker gets. So, in the absence of any actual evidence, I'd still expect a problem. On top of that, there is some evidence. Basically all the papers found by this search show some evidence of vitamin D deficiency in Swedish people: https://scholar.google.com/scholar?start=10&q=sweden+vitamin...