Fix "QML AnimatedImage: Error Reading Animated Image File" warning.

[JulianGro]

Fixes:

[04/24 10:27:22] [WARNING] [default] qrc:/qml/hifi/overlays/ImageOverlay.qml:9:5: QML AnimatedImage: Error Reading Animated Image File qrc:/qml/hifi/overlays/images/tools/progress-background.svg

This must have been broken for quite some years already. Don't ask me what this does. It appears to be some sort of progress bar used in Create app, but the warning appears without even opening Create. ¯_(ツ)_/¯