fix: add bgColor type in RadialLinearScaleOptions (#11081)

* fix: add bgColor type in RadialLinearScaleOptions

* Update src/types/index.d.ts

remove trailing space

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Co-authored-by: Jacco van den Berg <[email protected]>

Author: choichoijin

src/types/index.d.ts

@@ -3316,6 +3316,8 @@ export type RadialTickOptions = TickOptions & {
 }
 
 export type RadialLinearScaleOptions = CoreScaleOptions & {
+  backgroundColor: Color;
+
   animate: boolean;
 
   startAngle: number;