fix playwright >=1.53 hanging issue caused by global fake module variable not being deleted after the selector engine is registered
          #53
        
          
      
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this was causing very strange issues on one of the sites at work. it was intermittently hanging after navigating to a page if the next playwright action uses a custom selector engine.
i'm not sure exactly what was going on, but i don't think it's safe to mess with the globals without cleaning it up afterwards anyway