egui-winit: Don't consume clipboard shortcuts

[Dinnerbone]

This breaking change seems to have snuck in during #3649. Previously it would never consume these, today it consumes them unconditionally, and with this change it'll only consume them if egui wants text input never consume them.

This is a blocker for updating our application, sadly :(

[rustbasic]

@emilk @Dinnerbone
My program uses something like below:

    if ui.input_mut(|i| i.events.last() == Some(&Event::Copy))
    || ui.input_mut(|i| i.events.last() == Some(&Event::Cut))
    {

    }

1. I think it would be a good idea to consume the keycode when the key is released.
   ( or )
2. I think it would be nice to have the ability to turn on/off events or various basic keys (ex: Ctrl+A, Ctrl+C, Ctrl+K Ctrl+Z...) in TextEdit.

[emilk]

@rustbasic let's consider what to do there in a separate issue or PR. It feels like a much larger issue.

For now I think it makes sense to revert to the old behavior of only considering Copy/Cut/Paste consumed if egui has wants_keyboard_input set, i.e. if a TextEdit is selected.