Avoid malformed 'Individual' call to api3

Overview

Passing in $custom_group['extends'] as the entity within PreData.php can trigger a malformed call to APIv3 where, instead of using the Contact entity, will attempt to use 'Individual'.

Details Error message

CRM_Core_Exception: Malformed name in civicrm_api3() (line 135 of civicrm/api/api.php).

Variable details at time of error

$action: 'getsingle'
$entity: 'Individual'
$result["error_code"]: 'not-found'
$result['error_message']: "API (Individual, get) does not exist (join the API team and implement it!)"

Backtrace

civicrm_api3 ([webroot]/sites/all/modules/civicrm/api/api.php:135)
CRM_Civirules_Utils_PreData::customPre ([webroot]/sites/all/civicrm-custom/extensions/org.civicoop.civirules/CRM/Civirules/Utils/PreData.php:108)
civirules_civicrm_customPre ([webroot]/sites/all/civicrm-custom/extensions/org.civicoop.civirules/civirules.php:468)
CRM_Utils_Hook->runHooks ([webroot]/sites/all/modules/civicrm/CRM/Utils/Hook.php:284)
CRM_Utils_Hook_DrupalBase->invokeViaUF ([webroot]/sites/all/modules/civicrm/CRM/Utils/Hook/DrupalBase.php:73)
Civi\Core\CiviEventDispatcher::delegateToUF ([webroot]/sites/all/modules/civicrm/Civi/Core/CiviEventDispatcher.php:322)
Symfony\Component\EventDispatcher\EventDispatcher->callListeners ([webroot]/sites/all/modules/civicrm/vendor/symfony/event-dispatcher/EventDispatcher.php:251)
Symfony\Component\EventDispatcher\EventDispatcher->dispatch ([webroot]/sites/all/modules/civicrm/vendor/symfony/event-dispatcher/EventDispatcher.php:73)
Civi\Core\CiviEventDispatcher->dispatch ([webroot]/sites/all/modules/civicrm/Civi/Core/CiviEventDispatcher.php:263)
CRM_Utils_Hook->invoke ([webroot]/sites/all/modules/civicrm/CRM/Utils/Hook.php:168)
CRM_Utils_Hook::customPre ([webroot]/sites/all/modules/civicrm/CRM/Utils/Hook.php:564)
CRM_Core_BAO_CustomValueTable::create ([webroot]/sites/all/modules/civicrm/CRM/Core/BAO/CustomValueTable.php:67)
CRM_Core_BAO_CustomValueTable::store ([webroot]/sites/all/modules/civicrm/CRM/Core/BAO/CustomValueTable.php:407)
CRM_Contact_BAO_Contact::create ([webroot]/sites/all/modules/civicrm/CRM/Contact/BAO/Contact.php:384)
_civicrm_api3_contact_update ([webroot]/sites/all/modules/civicrm/api/v3/Contact.php:571)
civicrm_api3_contact_create ([webroot]/sites/all/modules/civicrm/api/v3/Contact.php:99)
Civi\API\Provider\MagicFunctionProvider->invoke ([webroot]/sites/all/modules/civicrm/Civi/API/Provider/MagicFunctionProvider.php:89)
Civi\API\Kernel->runRequest ([webroot]/sites/all/modules/civicrm/Civi/API/Kernel.php:158)
Civi\API\Kernel->runSafe ([webroot]/sites/all/modules/civicrm/Civi/API/Kernel.php:81)
civicrm_api ([webroot]/sites/all/modules/civicrm/api/api.php:22)

After With this PR, the $entity passed to the API call is set the custom group's extended entity, to ensure that an 'Individual' custom group returns 'Contact' for the sake of the call.