[gdk-pixbuf] tests: Add test case for ICO quality sorting bug

[Bastien Nocera <hadess src gnome org>]

commit 9ac5cc0404526b58ac2196ade0f80fd84768003f
Author: Bastien Nocera <hadess hadess net>
Date:   Wed Jul 26 16:01:21 2017 +0200

    tests: Add test case for ICO quality sorting bug
    
    https://bugzilla.gnome.org/show_bug.cgi?id=785447

 tests/test-images/reftests/bug785447.ico         |  Bin 0 -> 235563 bytes
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diff --git a/tests/test-images/reftests/bug785447.ico b/tests/test-images/reftests/bug785447.ico
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