change regex for name-searching to match synapse behaviour

database.php

@@ -281,12 +281,12 @@ class mxDatabase
 		$term = filter_var($search_term, FILTER_SANITIZE_STRING);
 		$result = array();
 		$sql = "SELECT COUNT(*) FROM logins WHERE"
-			. " localpart LIKE '%" . $term . "%';";
+			. " localpart LIKE '" . $term . "%';";
 		$res = $this->db->query($sql);
 
 		if ($res->fetchColumn() > 0) {
 			$sql = "SELECT first_name, last_name, localpart FROM logins WHERE"
-				. " localpart LIKE '%" . $term . "%';";
+				. " localpart LIKE '" . $term . "%';";
 			foreach ($this->db->query($sql) as $row) {
 				array_push($result, [
 					"display_name" => $row["first_name"] . " " . $row["last_name"],