CustomValue gettree api - More accurate permission check

[colemanw]

Overview

Fix for civicrm/org.civicrm.civicase#110

Before

Cannot call the gettree api from ajax without administer CiviCRM permission.

After

Can call the gettree api from ajax with permission to view the main object.

[civibot]

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[colemanw]

Ping @pradpnayak

[pradpnayak]

Hi @colemanw,

Thanks for the patch. It works now when gettree action is called from ajax.