Code review comment for lp:~mcintire-evan/unity/add_screenshot_shortcut_hints

Sorry, there's a compilation issue because a different variable name has been used:

/«BUILDDIR»/unity-7.4.0+16.04.20151217/shortcuts/ShortcutHint.cpp: In member function 'virtual bool unity::shortcut::Hint::Fill()':
/«BUILDDIR»/unity-7.4.0+16.04.20151217/shortcuts/ShortcutHint.cpp:161:46: error: 'settings' was not declared in this scope
       glib::String key(g_settings_get_string(settings, arg1().c_str()));