Removed include check

<unx/gtk/gtksalmenu.hxx> is already included at the beginning of
the file.
So no need to check to include it.

Change-Id: I66988734271fa8fe8434e8090337f0ab14a8b994
Reviewed-on: https://gerrit.libreoffice.org/44646Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Mark Page <aptitude@btconnect.com>

vcl/unx/gtk/gtksalframe.cxx

@@ -43,9 +43,6 @@
 #include <config_gio.h>
 
 #include <unx/x11/xlimits.hxx>
-#if ENABLE_DBUS && ENABLE_GIO
-#  include <unx/gtk/gtksalmenu.hxx>
-#endif
 #if defined ENABLE_GMENU_INTEGRATION // defined in gtksalmenu.hxx above
 #  include <unx/gtk/hudawareness.h>
 #endif