Add peer_ip length to 50 (#580)

Co-authored-by: 杨赫然 <heran.yang@seafile.com>

scripts/sql/mysql/seafile.sql

@@ -216,7 +216,7 @@ CREATE TABLE IF NOT EXISTS RepoTokenPeerInfo (
   id BIGINT NOT NULL PRIMARY KEY AUTO_INCREMENT,
   token CHAR(41),
   peer_id CHAR(41),
-  peer_ip VARCHAR(41),
+  peer_ip VARCHAR(50),
   peer_name VARCHAR(255),
   sync_time BIGINT,
   client_ver VARCHAR(20),