stat_ecdf() responds to scale transform
          #5115
        
          
      
                
     Merged
            
            
          
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This PR aims to fix #5112 and #5113.
Because this stat used to have
y = after_stat(y), it computed a column namedy. This, of course, is recognised as a position aesthetic, but that also meant that it was back-transformed inscales_backtransform_df()(whereas it shouldn't be). The fix proposed herein is to simply rename the computed aesthetic toecdfsuch that it is no longer automatically backtransformed.