fix: update init value is_safe

Co-authored-by: Copilot <[email protected]>

Author: phv2312

libs/ktem/ktem/index/file/ui.py

@@ -1075,7 +1075,7 @@ def _may_extract_zip(self, files, zip_dir: str):
 
             with zipfile.ZipFile(zip_file, "r") as zip_ref:
                 # Check for symlinks and path traversal attacks at zip level
-                is_safe = False
+                is_safe = True
 
                 for member in zip_ref.infolist():
                     # Disallow symlinks