Fix for v2.4.1 (#114)

remove `Zgamma`, add divide by 2 for sum of weight bugs

Author: Moelf

LocalPreferences.toml

@@ -2,5 +2,5 @@
 precompile_workload = false
 
 [WVZAnalysis]
-BDT_MODEL_DIR = "/data/jiling/WVZ/v2.3-2023_06_12_hists/"
+BDT_MODEL_DIR = "/data/jiling/WVZ/v2.4.1-2023_07_03_hists/"
 MINITREE_DIR = "/data/grabanal/WVZ/v2.4.1/"