Revert "Recognize pwsh.exe as a valid parent process on Windows."

This reverts commit 2bda5e9.

Author: jamwil

aider/run_cmd.py

@@ -31,7 +31,7 @@ def get_windows_parent_process_name():
             if parent is None:
                 break
             parent_name = parent.name().lower()
-            if parent_name in ["pwsh.exe", "powershell.exe", "cmd.exe"]:
+            if parent_name in ["powershell.exe", "cmd.exe"]:
                 return parent_name
             current_process = parent
         return None
@@ -50,7 +50,7 @@ def run_cmd_subprocess(command, verbose=False, cwd=None, encoding=sys.stdout.enc
         # Determine the appropriate shell
         if platform.system() == "Windows":
             parent_process = get_windows_parent_process_name()
-            if parent_process in ["pwsh.exe", "powershell.exe"]:
+            if parent_process == "powershell.exe":
                 command = f"powershell -Command {command}"
 
         if verbose: