Skip deleting copied dask dataframe to avoid crash while creating fro…

…m cudf edge lists

python/cugraph/cugraph/structure/graph_implementation/simpleDistributedGraph.py

@@ -1193,7 +1193,5 @@ def _get_column_from_ls_dfs(lst_df, col_name):
     if len_df == 0:
         return lst_df[0][col_name]
     output_col = cudf.concat([df[col_name] for df in lst_df], ignore_index=True)
-    for df in lst_df:
-        df.drop(columns=[col_name], inplace=True)
-    gc.collect()
+    # FIXME: For now, don't delete the copied dataframe to avoid crash
     return output_col