QIosFileDialog - properly handle QUrl for assets-library

For QT_PLATFORM_UIKIT 'PicturesLocation' manually appended by "assets-library://".
When converted to QUrl, such a path becomes a valid url, having empty path
and scheme "assets-library". Later in QIOSFileDialog we convert this
path (options()->initialDirectory()) calling QUrl::toLocalPath, which
gives us an empty string and thus we erroneusly select document picker
dialog, not an image picker. So let's also check a scheme, not path
only.

Fixes: QTBUG-107844
Change-Id: If4dd453549b37933cba07b5d7af6e45f2504dd29
Reviewed-by: Richard Moe Gustavsen <[email protected]>
(cherry picked from commit 402a526b2a87cbf6b7466bacb9dd3d8b7c71d9b2)
Reviewed-by: Qt Cherry-pick Bot <[email protected]>

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