Fixed a case when template variable is WindowsPath (#2707)

Co-authored-by: NtWriteCode <NtWriteCode@users.noreply.github.com>

src/virtualenv/activation/via_template.py

@@ -48,7 +48,7 @@ def _generate(self, replacements, templates, to_folder, creator):
             if dest.exists():
                 dest.unlink()
             # Powershell assumes Windows 1252 encoding when reading files without BOM
-            encoding = "utf-8-sig" if template.endswith(".ps1") else "utf-8"
+            encoding = "utf-8-sig" if str(template).endswith(".ps1") else "utf-8"
             # use write_bytes to avoid platform specific line normalization (\n -> \r\n)
             dest.write_bytes(text.encode(encoding))
             generated.append(dest)