[RSKPlaceholderTextView] [caretRect(for:)] Fix `caretRect.origin.x` for `.rightToLeft` layout direction.
[RSKPlaceholderTextView] [caretRect(for:)] Fix `caretRect.origin.x` for `.rightToLeft` layout direction.

ruslanskorb/RSKPlaceholderTextView,ruslanskorb/RSKPlaceholderTextView