use OnlyShowIn=; to not list "Open Folder" in the menu editor

[Sebastien Bacher <seb128 ubuntu com>]

The "Open Folder" is listed in the "Open With" list and as hidden in the
menu editor, that's probably not something users need though. Using
OnlyShowIn=; would make it not been listed there. Patch attached to the
mail and on http://bugzilla.gnome.org/show_bug.cgi?id=439685

Index: nautilus-folder-handler.desktop.in.in
===================================================================
--- nautilus-folder-handler.desktop.in.in	(révision 12895)
+++ nautilus-folder-handler.desktop.in.in	(copie de travail)
@@ -4,6 +4,7 @@
 TryExec=nautilus 
 Exec=nautilus --no-desktop %U
 NoDisplay=true
+OnlyShowIn=;
 Terminal=false
 StartupNotify=true
 Type=Application