Fix hotkeys not getting unbound correctly when unbinding them in the ui

TODO

@@ -245,3 +245,5 @@ Show a question mark beside options. When hovering the question mark show a tool
 Remove all mgl::Clock usage in Overlay. We only need to get the time once per update in Overlay::handle_events. Also get time in other places outside handle_events.
 
 Handle stopping replay/stream when recording is running (show notification that the video is saved and move the video to folder with game name).
+
+Support translations.

src/GlobalHotkeys/GlobalHotkeysLinux.cpp

@@ -193,7 +193,7 @@ namespace gsr {
             return false;
         }
 
-        if(hotkey.key == 0) {
+        if(hotkey.key == 0 || hotkey.key == XK_VoidSymbol) {
             //fprintf(stderr, "Error: GlobalHotkeysLinux::bind_key_press: hotkey requires a key\n");
             return false;
         }