[PATCH] Fix theme change bug for applyColors theme SVGs

[Jamboarder]

This patch fixes a current bug that does not respect
"hint-apply-color-scheme" hint when changing Plasma
themes.

This bug only occurs when changing from themes with
SVGs that do not have the hint element (e.g. default
theme to themes with SVGs that do contain the hint
element (e.g. Aya).

I'll commit shortly if there are no objections.

Hope this helps,
Andrew (Jamboarder) Lake
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