Fix the indices of arguments for RadialAxial. It is related to #10646.

[tamuratak]

Fix the indices of arguments for the shading pattern of RadialAxial with SVG backend. It is related to #10646.

Load http://warp.da.ndl.go.jp/info:ndljp/pid/10205551/www.city.niigata.lg.jp/shisei/koho/kohoshi/shiho/backnumber/h25/shiho0217/pdf/0217_P1.pdf with SVG backend. Then we can see the following error in the console.

Uncaught (in promise) TypeError: object null is not iterable (cannot read property Symbol(Symbol.iterator)) (svg.js:1199)
    at SVGGraphics._makeShadingPattern (svg.js:1199)
    at SVGGraphics.shadingFill (svg.js:1073)
    at SVGGraphics.executeOpTree (svg.js:647)
    at SVGGraphics.group (svg.js:472)
    at SVGGraphics.executeOpTree (svg.js:728)
    at SVGGraphics.group (svg.js:472)
    at SVGGraphics.executeOpTree (svg.js:728)
    at eval (svg.js:540)

With this PR, the shading patterns are rendered well.

[timvandermeij]

/botio-linux preview

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[timvandermeij]

Nice find; thank you for the fix!