[REF] Fix some additional issues where curly braces were being used t… #17599
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…o access string or array offsets
Overview
This fixes another couple of issues with {} being used to access array/string offsets
Before
Code having issues on PHP7.4
After
Code works on PHP7.4
ping @eileenmcnaughton
Tests that demonstrate the issues https://test.civicrm.org/job/CiviCRM-Core-Edge/513/CIVIVER=master,label=test-3/testReport/(root)/api_v3_ACLPermissionTest/testContactGetNoResultsHook_with_data_set__0/ https://test.civicrm.org/job/CiviCRM-Core-Edge/513/CIVIVER=master,label=test-3/testReport/(root)/api_v3_CustomFieldTest/testCustomFieldCreateAllAvailableFormInputs/ and
CRM_Core_Page_HookTest