Fixes #1295 Signature warnings and undefined constant

Status changed to merged

mentioned in commit f2ecc19f

@uma.s There are a few more occurrences of this issue. See lines:

https://code.vtiger.com/vtiger/vtigercrm/blob/master/modules/Calendar/actions/DragDropAjax.php#L107

https://code.vtiger.com/vtiger/vtigercrm/blob/master/modules/Calendar/actions/DragDropAjax.php#L234

https://code.vtiger.com/vtiger/vtigercrm/blob/master/modules/Calendar/actions/DragDropAjax.php#L246

@lord_alan Thank you! I will check through these warnings.

@uma.s I already fixed these in my earlier merge request: !642 (comment 9317)

Yes! @lord_alan your right, Pervious merge request addressed them. Thank you!