Issue 806 : Remove Vine embed, add Screencast embed.

Add a Screencast embed, thanks to designsimply's URL in:
https://core.trac.wordpress.org/ticket/24660
Because Vine isn't supported anymore, remove its test URL.
@see wordpress-develop/src/wp-includes/class-oembed.php

bin/create-embed-test-post.php

@@ -131,7 +131,7 @@ function amp_get_test_data_entries() {
 		),
 		array(
 			'heading' => 'Photobucket Embed',
-			'content' => 'http://s1284.photobucket.com/user/adonchin/media/20171116_181841_zpsrjuop6u7.jpg.html',
+			'content' => 'http://i69.photobucket.com/albums/i70/apheli0n/quick%20uploads/addsiteerror.jpg',
 		),
 		array(
 			'heading' => 'Polldaddy Poll oEmbed',
@@ -157,6 +157,10 @@ function amp_get_test_data_entries() {
 			'heading' => 'Reverb Nation Embed',
 			'content' => 'https://www.reverbnation.com/fernandotorresleiva/song/28755694-breve-amor-new-version',
 		),
+		array(
+			'heading' => 'Screencast Embed',
+			'content' => 'http://screencast.com/t/nMCYr3N3uF',
+		),
 		array(
 			'heading' => 'Scribd Embed',
 			'content' => 'http://www.scribd.com/doc/110799637/Synthesis-of-Knowledge-Effects-of-Fire-and-Thinning-Treatments-on-Understory-Vegetation-in-Dry-U-S-Forests',
@@ -205,10 +209,6 @@ function amp_get_test_data_entries() {
 			'heading' => 'Vimeo Embed',
 			'content' => 'https://vimeo.com/59172123',
 		),
-		array(
-			'heading' => 'Vine Embed',
-			'content' => '[vine url="https://vine.co/v/bEIHZpD2JWz"]',
-		),
 		array(
 			'heading' => 'WordPress Plugin Directory Embed',
 			'content' => 'https://wordpress.org/plugins/amp/',