cmd: always print elapsed time to tenth place seconds in progress

Before this change, the elapsed time shown with the --progress flag
would not print ".0s" so the elapsed time.

This change will make it so that the line width is kept a bit more
consistent by always printing to a fixed-point.

This does change the displayed value when the elapsed time
is less than 1s, in which it used to be that the value would be shown
in ms or smaller units.

Signed-off-by: Gary Kim <gary@garykim.dev>

fs/accounting/stats.go

@@ -250,11 +250,11 @@ func (s *StatsInfo) String() string {
 
 	dt := s.totalDuration()
 	dtSeconds := dt.Seconds()
+	dtSecondsOnly := dt.Truncate(time.Second/10) % time.Minute
 	speed := 0.0
 	if dt > 0 {
 		speed = float64(s.bytes) / dtSeconds
 	}
-	dtRounded := dt - (dt % (time.Second / 10))
 
 	displaySpeed := speed
 	if fs.Config.DataRateUnit == "bits" {
@@ -329,7 +329,7 @@ func (s *StatsInfo) String() string {
 			_, _ = fmt.Fprintf(buf, "Transferred:   %10d / %d, %s\n",
 				s.transfers, totalTransfer, percent(s.transfers, totalTransfer))
 		}
-		_, _ = fmt.Fprintf(buf, "Elapsed time:  %10v\n", dtRounded)
+		_, _ = fmt.Fprintf(buf, "Elapsed time:  %10ss\n", strings.TrimRight(dt.Truncate(time.Minute).String(), "0s")+fmt.Sprintf("%.1f", dtSecondsOnly.Seconds()))
 	}
 
 	// checking and transferring have their own locking so unlock