Fix line/scatter chart x axis options being overridden

[jasperNura]

Issue

This PR resolves an issue where some of the parameters passed to the charting libraries are overridden. This prevents the use of logarithmic axes or the repositioning of the axis. Theorectically this would also allow a separately defined custom axis to used, but this is untested.

Example

Consider

= line_chart({1 => 0, 10 => -1, 100 => -2, 1000 => -3}, library: { scales: {x: {type: "logarithmic", position: "top"}}})

The current behaviour:

Modified behaviour:

[ankane]

Looks great, thanks @jasperNura!