Update keybind tip when changed from defaults

[qwerty01]

When keybinds are changed from their default configurations, the UI's cheat sheet at the bottom no longer reflects the current configuration (for example, after changing resize to ctrl+r, the bottom tip text still shows ctrl+n).

It might not be easy to add since someone could significantly change keybind layouts from the default (such as trying to emulate a tmux configuration), but maybe it could work for small changes.

[a-kenji]

Thank you for taking the time writing this issue!
For anyone wanting to pick this up:

• There is a starting point as a pr: get_mode_info based on keybinds #319
• There is an issue talking about it: Feature(Status-Bar): React to Keybind Changes  #246

[har7an]

This should be fixed with #1242. If you still miss some particular aspect about "dynamically" updating the keybindings, don't hesitate to reopen this issue!