EnhancedBiasWeighter: Use only TDT for EB weights calculation
Finish the migration of the EB weights computing script.
Now, TDT has to be always used in order to check if the HLT seeded chains could have passed, instead of checking if a chain passed based on the decisions in the output file.
Also, for the HLT seeded chains, the L1 seed prescale is now used (not the prescale created by seeds applied at HLT).
Tagging @tamartin