Include wx/colour.h according to precompiled headers of wx/wx.h (with other minor cleaning).

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@39724 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/html/htmltag.cpp

@@ -18,10 +18,10 @@
 #include "wx/html/htmltag.h"
 
 #ifndef WXPRECOMP
+    #include "wx/colour.h"
 #endif
 
 #include "wx/html/htmlpars.h"
-#include "wx/colour.h"
 #include <stdio.h> // for vsscanf
 #include <stdarg.h>