Fix in isEM bitmask for PrecisionPhotonHypo
This is a fix for 0 counts in photon triggers, with full chain, including ElectronPhotonSelectorTools in the hypothesis. Detailed discussion in ATR-18929.
In summary additional debugging messages were added in the TrigEgammaPrecisionPhotonHypo tool and fixed configuration of the isEM bitmasks of the configured ElectronPhotonSelectorTools within.
References updated and flake tests passed locally
Edited by Fernando Monticelli