Fixed seed_type related bugs in HitDVHypo(ATR-19322).

Fixed bugs introduced when seed_type format was changed from [HLTJet:0, SP:1] to [HLTJet:2, SP:4].

All hard-coded int for seed_type are replaced with enum SeedType.

This MR also solves the problem that the trigger rate went 0 which was reported in ATR-19322.