Prescale D02KSKS DDDD DDLD Loose and Tight lines

The MR applies a prescale to D02KSKS HLT2 lines with high bw:

• DDDD, DDLD --> prescale = 0.01
• DDDDTight, DDLDTight --> prescale = 0.03

BW of lines should be reduced to 0.6 MB/s for all 4 lines.

Closes #851.

FYI @gtuci @gpunzi @fbetti @tpajero @cacochat @aanelli