Clear message InputField text on Escape event key (#72)

ui.go

@@ -371,6 +371,7 @@ func onMessageInputFieldInputCapture(e *tcell.EventKey) *tcell.EventKey {
 		text = messageInputField.GetText() + text
 		messageInputField.SetText(text)
 	case tcell.KeyEscape:
+		messageInputField.SetText("")
 		messageInputField.SetTitle("")
 		selectedMessage = 0
 	}