shell32: Automatically expand CPL applet path string (try 2)

[Hermès BÉLUSCA - MAÏTO]

Symptom: when running “control.exe
%systemroot%\system32\some_custom_cpl.cpl” (or “rundll32.exe
shell32.dll,Control_RunDLL %systemroot%\system32\some_custom_cpl.cpl”, or
even, loading a CPL registered in HKLM\Software\Microsoft\Windows\Control
Panel\Cpls), it fails because the path string is not expanded.
Solution: always expand the CPL applet path string, so that, if it contains
environment variables, they get expanded, and if not, the usual behaviour is
obtained.
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