message: Simplify digraph doesActionApply code
diff: @@ -323,7 +323,7 @@ class CommandInsertDigraph extends BaseCommand {
  if (!super.doesActionApply(vimState, keysPressed)) {
  return false;
  }
  - const chars = keysPressed.slice(1, keysPressed.length).join('');
  + const chars = keysPressed.slice(1, 3).join('');
  if (chars.length < 2) {
  return false;
  }
  