Flow. Use new method to interpolate stacking move-up events: match expected block's height

cfatools/processor/flow.py

@@ -728,7 +728,7 @@ def get_absolute_melted_height_expected(arrival_df: pd.DataFrame,
     if len(arrival_df[arrival_df["melted_height"] == 0].index) > 2:
         arrival_df.loc[:arrival_df[arrival_df["melted_height"] == 0].tail(2).index[0], "melted_height"] = np.nan
 
-    arrival_df = arrival_df.drop(columns=["time_diff", "ice_speed"])
+    arrival_df = arrival_df.drop(columns=["time_diff", "position_diff", "ice_speed"])
     arrival_df = arrival_df.rename(columns={"melted_height": "melted_height_expected"})
 
     return arrival_df