Potential fix for code scanning alert no. 16: Uncontrolled data used in path expression

Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>

Author: kimocoder

wifite/attack/portal/server.py

@@ -189,8 +189,8 @@ def _serve_error_page(self):
     def _serve_static_file(self, path):
         """Serve static files (CSS, images, etc.) with caching optimization."""
         try:
-            # Remove /static/ prefix
-            file_path = path[8:]  # Remove '/static/'
+            # Remove /static/ prefix and ensure a relative path
+            file_path = path[8:].lstrip('/\\')  # Remove '/static/' and any leading separators
             filename = os.path.basename(file_path)
 
             # Try to get cached static file from server instance