fix _get_file_path util function

Author: softwareengineerprogrammer

src/geophires_x/EconomicsSam.py

@@ -143,7 +143,3 @@ def _sig_figs(val: float, num_sig_figs: int) -> float:
     except TypeError:
         # TODO warn
         return val
-
-
-def _get_file_path(file_name) -> str:
-    return os.path.join(os.path.abspath(os.path.dirname(__file__)), file_name)

src/geophires_x/EconomicsSamCashFlow.py

@@ -1,14 +1,14 @@
 from __future__ import annotations
 
 import csv
+import os
 import re
 from functools import lru_cache
 from typing import Any
 
 from PySAM import Singleowner
 
 from geophires_x import Model as Model
-from geophires_x.EconomicsSam import _get_file_path
 
 
 @lru_cache(maxsize=12)
@@ -199,3 +199,7 @@ def ga(_p):
         return prop(soo)
 
     return getattr(soo, prop)
+
+
+def _get_file_path(file_name) -> str:
+    return os.path.join(os.path.abspath(os.path.dirname(__file__)), file_name)