Undef RGB where it was defined, not where it gets used

Change-Id: I1e122bb7c32850dfdd74de029c8d92a328207a95
Reviewed-on: https://gerrit.libreoffice.org/20430Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

fpicker/source/win32/filepicker/VistaFilePicker.cxx

@@ -43,9 +43,6 @@
 #include <osl/mutex.hxx>
 #include <osl/file.hxx>
 #include <tchar.h>
-#ifdef RGB
-#undef RGB
-#endif
 #include <officecfg/Office/Common.hxx>
 
 #ifdef _MSC_VER

fpicker/source/win32/filepicker/platform_vista.h

@@ -36,6 +36,7 @@
 #if defined _MSC_VER
 #pragma warning(push, 1)
 #include <comip.h>
+#undef RGB
 #pragma warning(pop)
 #endif