Change default value for reg_date in table cp_createlog

[vietlubu]

File: data/schemas/logindb/cp_createlog.20080928225124.sql

Error:

Testi with MySQL 5.7 and PHP 7.1

Exception Flux_Error: Critical MySQL error in Installer/Updater: Invalid default value for 'reg_date'

Reason:

For currently reg_date defined by:

`reg_date` datetime NOT NULL default '0000-00-00 00:00:00',

But as I remember from MySQL 5.6 default '0000-00-00 00:00:00' not support anymore.

Solution:

Remove default value field reg_date. Default with 0000-00-00 00:00:00' don't make any benefit for this table.

[danieldpl]

This update is necessary for newer MySQL versions.
However, it would be better to apply an additional change:

ALTER TABLE `cp_createlog`
MODIFY COLUMN `reg_date` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP;

This allows the reg_date field to automatically store the account creation date without causing compatibility issues.