Media: Display the unsaved changes dialog in image edit form using jQuery .text() function.

This ensures that HTML entities like non-breaking spaces are properly displayed instead of being encoded.

Props jdy68, sebastienserre, audrasjb, mukesh27, SergeyBiryukov.
Fixes #54232.

git-svn-id: https://develop.svn.wordpress.org/trunk@51907 602fd350-edb4-49c9-b593-d223f7449a82

src/js/_enqueues/lib/image-edit.js

@@ -893,7 +893,7 @@
 			pop = this.intval( $('#imgedit-undone-' + postid).val() );
 
 		if ( pop < history.length ) {
-			if ( confirm( $('#imgedit-leaving-' + postid).html() ) ) {
+			if ( confirm( $('#imgedit-leaving-' + postid).text() ) ) {
 				return false;
 			}
 			return true;