fixed wxFrame background colour in wxUniv on ports without native wxSYS_COLOUR_APPWORKSPACE

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@44058 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/univ/colschem.h

@@ -53,21 +53,24 @@ public:
         SHADOW_HIGHLIGHT,
         SHADOW_IN,
         SHADOW_OUT,
-        
+
         // the titlebar background colours for the normal and focused states
         TITLEBAR,
         TITLEBAR_ACTIVE,
-        
+
         // the titlebar text colours
         TITLEBAR_TEXT,
         TITLEBAR_ACTIVE_TEXT,
-        
+
         // the default gauge fill colour
         GAUGE,
 
         // desktop background colour (only used by framebuffer ports)
         DESKTOP,
 
+        // wxFrame's background colour
+        FRAME,
+
         MAX
     };