The nondescript storefront in the 1100-block of Kingsway has paper covering all of its windows except for a neon “open” sign that is still illuminated just before 11 p.m. on a Sunday. The yellow awning overhead suggests the building houses an auto repair shop. But just inside the front door is another sign — King Canna. It is one of several illegal cannabis stores still operating in Vancouver more than 18 months after marijuana was…