Fix a memory leak in BPhysBGammaFinder

Semen Turchikhinrequested to merge
tursom/athena:21.2_fixBPHY20memory into 21.2

This MR fixes a memory leaks in BPhysBGammaFinder tool from DerivationFrameworkBPhys revealed in ATLBPHYS-223 causing failures of ART tests with BPHY20 derivation.

@tlyubush

Edited by Semen Turchikhin

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