WIP: Update UT reference FastShowerCellBuilderTool_test.ref

Artem Basalaevrequested to merge
ATLASSIM-4589 into master

UT test FastShowerCellBuilderTool_test was failing due to slight difference in the output. Updating the reference Fixes ATLASSIM-4589

Mentioning @mduehrss

Edited by Artem Basalaev

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