Fix CW tick events endless loop at shutdown

Fixed an edge case with console wallet shutdown where the tick events send
loop will continue to send key events after the receiver part of the channel
has been closed.

applications/tari_console_wallet/src/utils/crossterm_events.rs

@@ -70,8 +70,10 @@ impl CrosstermEvents {
                 ) {
                     Ok(true) => {
                         if let Ok(CEvent::Key(key)) = event::read() {
-                            if let Err(e) = tx.send(Event::Input(key)) {
-                                warn!(target: LOG_TARGET, "Error sending Tick event on MPSC channel: {}", e);
+                            if tx.send(Event::Input(key)).is_err() {
+                                info!(target: LOG_TARGET, "Tick event channel shutting down");
+                                // A send operation can only fail if the receiving end of a channel is disconnected.
+                                break;
                             }
                         }
                     },
@@ -81,8 +83,10 @@ impl CrosstermEvents {
                     },
                 }
                 if last_tick.elapsed() >= config.tick_rate {
-                    if let Err(e) = tx.send(Event::Tick) {
-                        warn!(target: LOG_TARGET, "Error sending Tick event on MPSC channel: {}", e);
+                    if tx.send(Event::Tick).is_err() {
+                        info!(target: LOG_TARGET, "Tick event channel shutting down");
+                        // A send operation can only fail if the receiving end of a channel is disconnected.
+                        break;
                     }
                     last_tick = Instant::now();
                 }