wayland: enable keys emitting key events on reis capability

When key events can be emitted with the Emulated Input protocol, this
can cause more keys to be supported. Update the supported keys when a
keyboard is received so some keys can be enabled immediately, without
switching the layout.

Fixes: 030ca29ddd ("wayland: add optional reis emulated input support")

src/wayland/dispatcher.rs

@@ -195,6 +195,7 @@ impl Dispatcher {
             device::Event::Interface { object } => {
                 if let Some(kbd) = object.downcast() {
                     self.seat.keyboard_mut().set_ei_keyboard(dev, kbd);
+                    self.seat.button_mut().update_keys_supported();
                 }
             },
             device::Event::Name { .. } => (),