Revert "KIconTheme: Prefer SVG files over PNG files"

EpicTux123 Penguinrequested to merge
epictux/kiconthemes:patch-1 into master

This reverts the following commit: a47280f3

Fixes bug https://bugs.kde.org/show_bug.cgi?id=516007 (until Qt implements the required thing upstream). See the bug report for more details.

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