Fix screen lock keyboard shortcut
Setting GNOME's keybinding for its own screensaver to '' does not always disable it as intended (in favor of our own custom Super+L keybinding) anymore: keybindings in org/gnome/settings-daemon/plugins/media-keys are now arrays of strings, not mere strings.
refs #19090 (closed)
Closes #19090 (closed)
Edited by intrigeri