Doesn't clear "series-line.emphasis.scale" during draging or zooming

### Version
5.0.2

### Steps to reproduce
Click on a point and start moving the chart (or scale).

```
myChart.setOption({
series:[{
type: 'line',
symbolSize: 0.1,
emphasis: {
scale: true,
lineStyle: {
width: 1,
},
},
lineStyle: {
width: 1,
},
data: Array.from(new Array(100)).map((x, i) => [i, Math.floor(Math.random() * (10 - 1 + 1)) + 1]),
}],
xAxis:[{type:'value'}],
yAxis:[{type:'value'}],
tooltip: {
trigger: 'axis',
},
dataZoom: [{
type: 'inside',
}]
})
```

### What is expected?
Old points are cleared.

### What is actually happening?
Old points aren't cleared.