Remove unwanted value recorded.
While doing Code walks, mentioned,  both "flag_value" and "value" are duplicates and used for recording flag value
```
label.String("flag_value", v),
label.String("command", meter.Command),
label.String("value", v),
```
Removing "value" in favor of the other.
@@ -179,7 +179,6 @@ func flagMetrics(ctx context.Context, meter skaffoldMeter, m metric.Meter, randL
label.String("flag_name", k),
label.String("flag_value", v),
label.String("command", meter.Command),
- label.String("value", v),
label.String("error", meter.ErrorCode.String()),
randLabel,
}
