Fix two more stray queries

models/Authentication.php

@@ -115,7 +115,7 @@ class Authentication
 	{
 		return Registry::get('db')->query('
 			UPDATE users
-			SET reset_key = {string:key},
+			SET reset_key = :key,
 				reset_blocked_until = UNIX_TIMESTAMP() + ' . static::DEFAULT_RESET_TIMEOUT . '
 			WHERE id_user = :id',
 			[

models/Tag.php

@@ -375,8 +375,8 @@ class Tag
 		return Registry::get('db')->queryPairs('
 			SELECT id_tag, tag, slug
 			FROM tags
-			WHERE LOWER(tag) LIKE {string:tokens} AND
-				kind = {string:person}
+			WHERE LOWER(tag) LIKE :tokens AND
+				kind = :person
 			ORDER BY tag ASC',
 			[
 				'tokens' => '%' . strtolower(implode('%', $tokens)) . '%',