Change ahmanalysis to use ensemble.load_scalars()

Author: jonathan-eq

src/semeio/workflows/ahm_analysis/ahmanalysis.py

@@ -180,7 +180,10 @@ def _replace(s: str) -> str:
         if target_name == "<ANALYSIS_CASE_NAME>":
             target_name = "analysis_case"
 
-        prior_data = prior_ensemble.load_all_gen_kw_data()
+        prior_data = prior_ensemble.load_scalars().to_pandas().set_index("realization")
+        prior_data.columns.name = None
+        prior_data.index.name = "Realization"
+        prior_data = prior_data.sort_index(axis=1)
         try:
             raise_if_empty(
                 dataframes=[