Fix echarts LineStyle color type error (#38207)
Fix echarts LineStyle color type error (#38207)

* Fix echarts LineStyle color type error

* Modified to string | string[]

dsebastien/DefinitelyTyped,georgemarshall/DefinitelyTyped,georgemarshall/DefinitelyTyped,dsebastien/DefinitelyTyped,mcliment/DefinitelyTyped,georgemarshall/DefinitelyTyped,georgemarshall/DefinitelyTyped,markogresak/DefinitelyTyped