fix: scale with one parameter

[blackvladimir]

This image did not work:

<svg xmlns="http://www.w3.org/2000/svg" width="90" height="90" viewBox="0 0 90 90" fill="none">
    <g transform="scale(2)">
        <circle cx="16" cy="15" r="11" fill="#000000"/>
    </g>
</svg>

SVG specification:

The scale(<x> [<y>]) transform function specifies a scale operation by x and y. If y is not provided, it is assumed to be equal to x.