Fix withdrawn amount equiality check

Co-authored-by: Jiaying Wang <42981373+jennijuju@users.noreply.github.com>

cmd/lotus-miner/actor.go

@@ -306,7 +306,7 @@ var actorWithdrawCmd = &cli.Command{
 			}
 
 			fmt.Printf("Successfully withdrew %s FIL\n", withdrawn)
-			if withdrawn != amount {
+			if withdrawn.LessThan(amount) {
 				fmt.Printf("Note that this is less than the requested amount of %s FIL\n", amount)
 			}
 		}