[REF] [Export] [Test] Update 2 more tests to use new helper

[eileenmcnaughton]

Overview

Just a minor change within the test class to use the newer helper

Before

$this->doExport used as the helper

After

$this->doExportTest used as the helper

Technical Details

The goal is to switch fully to the new helper which
a) tests the actual output not intermediary steps
b) requires less code
c) allows us to take some munge back out of the main class (once all are switched)

Comments

[civibot]

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[seamuslee001]

This only affects tests and the affected tests pass. Test failure is unrelated merging