[php8-compact] Fix Array to String in formButtons in CRM_Core_FormTest

[seamuslee001]

Overview

This fixes the following test error

CRM_Core_FormTest::testOpeningForms with data set "Find Contacts" ('civicrm/contact/search?reset=1')
Array to string conversion

/home/jenkins/bknix-edge/build/build-1/web/sites/default/files/civicrm/templates_c/en_US/%%ED/ED7/ED78F5CC%%formButtons.tpl.php:44

Before

Test fails on php8 due to array to string conversion

After

Test passes on php8

ping @demeritcowboy @eileenmcnaughton @totten @colemanw

[civibot]

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[demeritcowboy]

That's strange I can't reproduce the error locally with php 8 either in tests or opening the page in the browser. But in any case the location should be "bottom" here right? - since it's at the bottom. But otherwise looks fine.

[seamuslee001]

@demeritcowboy I was only finding it when I ran the full suite CRM_AllTests

[seamuslee001]

added MOP based on Dave's review and updated the location to be bottom