Don't update IP twice

- IP is updated in datasource#updateSession after successful login
- Remove no longer used DataSource#updateIp

src/main/java/fr/xephi/authme/datasource/SQLite.java

@@ -555,20 +555,6 @@ public class SQLite implements DataSource {
         return false;
     }
 
-    @Override
-    public boolean updateIp(String user, String ip) {
-        String sql = "UPDATE " + tableName + " SET " + col.IP + "=? WHERE " + col.NAME + "=?;";
-        try (PreparedStatement pst = con.prepareStatement(sql)) {
-            pst.setString(1, ip);
-            pst.setString(2, user);
-            pst.executeUpdate();
-            return true;
-        } catch (SQLException ex) {
-            logSqlException(ex);
-        }
-        return false;
-    }
-
     @Override
     public List<PlayerAuth> getAllAuths() {
         List<PlayerAuth> auths = new ArrayList<>();