[bindings] root.quit overrides help_menu.quit

[loralb]

Hello! Thank you very much for your work!

The title pretty much says it all, the value set in help_menu.quit is ignored (both the default one and a custom one), because it is overriden by whatever the value in root.quit is (both if changing this binding to a custom one and if leaving the default value).

EDIT: gitu --version -> gitu 0.25.0 System: Archlinux