Fixing some problems in the setup of the ElectronEfficiencyCorrectionTool for PLIV WPs

This MR is to fix several problems with the setup of the ElectronEfficiencyCorrectionTool for the PLIV WP in the TopEgammaCPTools.

• The PLIV-related checks were not done separately for the instances of the tool for Loose and Tight electrons, leading to the fact that e.g. the code crashed due to a seemingly unsupported ID+ISO-combination for loose electrons (even if the isolation WP in the top-config was set to None for loose leptons)

• The switch between the xxx.root and xxxECIDS.root files in the e/gamma calibration area (if UseElectronChargeIDSelection True is used) did not work. The same files were selected for both configurations.