Change key for fullscreen

[rubiin]

currently we have Alt+ENTER for fullscreen . This conflicts with jetbrains IDE where it shows context action
https://www.jetbrains.com/guide/java/tips/context-actions.
I propose we change this to bind = ,F11, fullscreen, 0
This is a sensible keybind https://longhurstconsulting.com/keyboard-shortcut-full-screen/