Allow activity summary test emails with $config['enableMail'] = false

If a DEV/Test environment of xF has $config['enableMail'] = false; within it's config.php, still allow sending of test emails ( /admin.php?activity-summary/ and /admin.php?tools/test-email ). This will allow testing of email systems without having to allow global sending of emails or utilise workarounds.

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source https://xfworld.net/threads/allow-activity-summary-test-emails-with-config-enablemail-false.47127/