This avoids having desk.cpl depend on a private function that may change
or disappear, and increase the probability of being able to use that CPL
across different Windows versions.
(Note: this pSetupMultiByteToUnicode was one of those whose name changed
between Windows 2000 and XP+)
Hide multiple monitor selection controls in this case.
Otherwise, show them when multiple monitors are detected
and hide the monitor preview bitmap.
This fixes the focus on the resolution slider when tested in Windows XP.
Also use the monitor bitmap globally, because it's used on multiple pages.
CORE-17939 CORE-10606