Membership edit shows confirmation and receipt status message even when "Send Confirmation and Receipt?" is unchecked

When you edit a membership and leave the "Send Confirmation and Receipt?" checkbox unchecked, no email sends but Civi still displays the confirmation message "A confirmation and receipt has been sent to ..."

The fix for now is a simple line adjustment to check for the status of that checkbox when displaying that message -

(Although - in the long term, it would be nice to adjust things such that the confirmation message only shows when the email is sent successfully. Right now, it's not at all dependent on the email actually sending.)