cmd/utils: disallow `--fakepow` for live operation (#3512)

cmd/utils/flags.go

@@ -749,7 +749,6 @@ func RegisterEthService(ctx *cli.Context, stack *node.Node, extra []byte) {
 		GpobaseCorrectionFactor: ctx.GlobalInt(GpobaseCorrectionFactorFlag.Name),
 		SolcPath:                ctx.GlobalString(SolcPathFlag.Name),
 		AutoDAG:                 ctx.GlobalBool(AutoDAGFlag.Name) || ctx.GlobalBool(MiningEnabledFlag.Name),
-		PowFake:                 ctx.GlobalBool(FakePoWFlag.Name),
 	}
 
 	// Override any default configs in dev mode or the test net