[RTL] Offcanvas close button doesn't switch place

Created by: SafaAlfulaij

Bug: Offcanvas close button doesn't switch place: https://github.com/twbs/bootstrap/blob/a9d7a62658c5d93dcba5ed5fc47d84f3ddd3e0a3/scss/_offcanvas.scss#L25

Originally posted by @SafaAlfulaij in https://github.com/twbs/bootstrap/issues/32330#issuecomment-860143097