Missing Matrix.mapPoints one parameter version iOS

@farfromrefug Can you please modify the function this way in canvas.ios.ts?

public mapPoints(...args) {
        let src: number[];
        let dstIndex: number = 0,
            srcIndex: number = 0,
            pointCount: number;
        const pts: number[] = args[0];
        if (args.length <= 2) {
            src = args[args.length-1];
        } else {
            dstIndex = args[1] || 0;
            srcIndex = args[3] || 0;
            pointCount = args[4];
            src = args[2];
        }
        src = src || pts;
        pointCount = Math.floor(pointCount || src.length);
        for (let index = 0; index < pointCount; index += 2) {
            const cgPoint = CGPointApplyAffineTransform(CGPointMake(src[index + srcIndex], src[index + srcIndex + 1]), this._transform);
            pts[index + dstIndex] = cgPoint.x;
            pts[index + dstIndex + 1] = cgPoint.y;
        }
    }

Start in canvas.ios.ts at Matrix.mapPoints and compare its current argument handling with the one-parameter behavior requested in the issue. Verify that the iOS implementation accepts the single points-array form and maps the points correctly; done means that form works without breaking the other documented argument forms.