MuonPRDTest: Updates DCube monitoring scripts

Hi, the aim of this merge request is to update the DCube monitoring scripts. As some variable names are changed in the outputs and some variables have been removed after the migration of the validation scripts.

The variable names are corrected in the DCube scripts and the nonexist variables are removed from the monitoring lists. For the variables which are defined in MuonTesterTree/IdentifierBranch.h and with unsigned char type (or signed char type for stationEta), they are decoded in python by using ord() function. For the stationEta variables, the ord() function haven't returned the negative numbers directly but returned (256 + x) for negative eta x (decoded uncorrectly). A function Eta(eta) have been defined to get the negative eta. The DCube histograms are checked and matched with the outputs.