Correctly sort line chart when the dimension axis has sort property
Correctly sort line chart when the dimension axis has sort property

Part of #1520

vega/vega-lite,uwdata/vega-lite,vega/vega-lite,uwdata/vega-lite,vega/vega-lite,vega/vega-lite,uwdata/vega-lite,uwdata/vega-lite,uwdata/vega-lite,vega/vega-lite