If the musical “Kinky Boots,” the story of a dying British shoe factory rebooted as purveyor of fetish footwear, triggers an urge to buy sexy red stilettos, just go with it.And, while you’re at it, snap up a ticket to “Kinky Boots.” It will put a toehold on you with its fact-based story of a young man taking steps to turn around the faltering Northampton factory he inherits from his dad.