chainntfs: fix the Pop method on confirmationHeap
chainntfs: fix the Pop method on confirmationHeap

bryanvu/lnd,ddustin/lnd,BitfuryLightning/lnd,aakselrod/lnd,BitfuryLightning/lnd,AndrewSamokhvalov/lnd,bryanvu/lnd,ddustin/lnd,LightningNetwork/lnd,LightningNetwork/lnd,aakselrod/lnd,AndrewSamokhvalov/lnd