Gemma Creagh cashes out of this underdog comedy. “Everybody hates bankers,” this is a line of dialogue, a plotpoint and the entire theme of Bank of Dave, all rolled into one. This film wholeheartedly continues the longstanding tradition of deeply sincere British underdog films, featuring heartwarming locals, the local pub – and no mention of divisive political views or Brexit whatsoever.  Awkward and skilled London lawyer Hugh (Joel Fry) is instructed  to venture outside the…