Using Linux mint 16, with XFCE as desktop environment. I have a problem removing the default keyboard shortcut (Super_L), for opening the Whisker menu.
The shortcut shows up in Application shortcuts, in the keyboard settings.Though, as shown in the image below, I am not able to remove it by clicking remove - nothing happens.

I have also tried modifying ~/.config/xfce4/xfconf/xfce-perchannel-xml/xfce4-keyboard-shortcuts.xml to no avail. I can not seem to find an entry for the xfce4-whiskermenu-plugin.
Even uninstalling the Whisker menu does not work.
So my question is, how do I stop the Whisker menu from hijacking my Windows/Super_L key? I want to bind this key to another application launcher.