Embeds: Allow post title to be filtered when preparing an oEmbed response.

By changing the way the post title is added to the array of data from `$post->post_title` to `get_the_title()`, the title can now be modified using the `the_title` filter. This ensures post titles returned in oEmbed responses are consistent with those that show on a site.

Props mheikkila, swissspidy.
Fixes #42826.

git-svn-id: https://develop.svn.wordpress.org/trunk@44907 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/embed.php

@@ -539,7 +539,7 @@ function get_oembed_response_data( $post, $width ) {
 		'provider_url'  => get_home_url(),
 		'author_name'   => get_bloginfo( 'name' ),
 		'author_url'    => get_home_url(),
-		'title'         => $post->post_title,
+		'title'         => get_the_title( $post ),
 		'type'          => 'link',
 	);