Fixes a bug in Midori 0.5.11 installer which caused bad rendering that was making the text hard to read (no background). In Windows it's visible as FillRect(0x89011a1f, 0x0019f87c, 0xabababab), and in ReactOS as SetBkMode(0xb5010fce, -1546139919). After a number of attempts to get the same behavior, I haven't found a way to fix it without a hack to make the installer look identical to Windows. At least I added handling for the incorrect value in SetBkMode. This shouldn't matter anywhere. It may not look the same as on Windows, but the text will at least be readable.