DerivationBPHY: Fix incorrect thinning logic (ATLBPHYS-252)

Adam Edward Bartonrequested to merge
abarton/athena:BPHYThinFix into master

Fix an issue where the thinning was not occurring. Looks like the thin handles don't work the same way as the thinning service and we were applying the logic incorrectly.

I remove the AND mode because I'm not convinced it is needed or even anyone understands how it works.

cc @wwalko

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