SvgItem: Initialise DPR when setting other SVGs

David Edmundsonrequested to merge
work/d_ed/svg_init into master

SVGItem has two paths to loading the raw SVG.

One is it owns the m_svg and you set an image path. The other path is where QML owns the KSVG object.

The underlying SVG needs an initial DPR being set for cases where an SVG is being added to an open window.

This was being handled in the setImagePath path, but not in setSvg

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