By Jamie Spencer Manchester United enjoyed a first Europa League win of the season over Greek champions PAOK at Old Trafford on Thursday, in what was Ruud van Nistelrooy’s penultimate game in charge. United were striving to avoid breaking a club record for the longest European win-less streak in their history, having not won in six games at the continental level since Harry Maguire’s solitary goal beat Copenhagen in the Champions League group stage over a year ago. But two goals from the hugely impressive Amad Diallo in the second half meant the run wasn’t extended to seven, firing United up t…