Fixed `enableYAxisLabel`

- Fixed the way the offset on the Y-Axis label is calculated when
`enableYAxisLabel` is set to NO.
- Fixed the way the labels are displayed when `enableYAxisLabel` is set
to NO.
- Deleted the calculation of the offset distance for Y-Axis Label
(since it was already done).
- Fixed the Y-Axis labels when `enableYAxisLabel` is set to NO.
- Fixed the position of the dots when `enableYAxisLabel` is set to NO.