Bugfix: fix the author image in the meta elements in html head (display module)

mod/display.php

@@ -420,7 +420,7 @@ function display_content(App $a, $update = 0) {
 		$title = trim(html2plain(bbcode($r[0]["title"], false, false), 0, true));
 		$author_name = $r[0]["author-name"];
 
-		$image = $a->remove_baseurl($r[0]["thumb"]);
+		$image = $a->remove_baseurl($r[0]["author-thumb"]);
 
 		if ($title == "") {
 			$title = $author_name;