Make Project Task notification emails work

Remove redundant code in ProjectTask Save.php that was interfering with the logic in populateFromPost that was already setting $GLOBALS['check_notify'] when necessary.

I believe this fixes SugarCRM support issue 45061 (see https://web.sugarcrm.com/support/issues/f3dd3788-e144-d0c1-e745-4e15c196eda8)