[BUGFIX] Stabilize a flaky unit test

getParseTimeReturnsZeroIfNoValuesAreSet() tends to fail sometimes
if $beUserInitialization is > 0 but $totalParseTime is 0. This
edge case of method getParseTime() is avoided by rearranging the call
order of $this->getMilliseconds() slightly.

Change-Id: If5cf00196f6739224c34011b0f8c1ef1f5bbb39a
Resolves: #81653
Related: #80742
Releases: master, 8.7
Reviewed-on: https://review.typo3.org/53297


Reviewed-by: Thomas Hohn <thomas@hohn.dk>
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Anja Leichsenring <anja.leichsenring@typo3.com>
Tested-by: Anja Leichsenring <anja.leichsenring@typo3.com>
Reviewed-by: Jan Helke <typo3@helke.de>
Tested-by: Jan Helke <typo3@helke.de>