progress: output final newline to terminal.Out

fmt.Println writes to stdout, which may be redirected and wrongly
included with the main program output (like the cat command)
instead of written to the terminal output.

Note the rest of the progress output goes to terminal.Out in
printProgress via terminal.Write()

cmd/progress.go

@@ -62,7 +62,7 @@ func startProgress() func() {
 				printProgress("")
 				fs.LogPrint = oldLogPrint
 				operations.SyncPrintf = oldSyncPrint
-				fmt.Println("")
+				fmt.Fprintln(terminal.Out, "")
 				return
 			}
 		}