revert last change

csst_common/data_manager.py

@@ -1049,10 +1049,10 @@ class CsstMsFile(dict):
     def fpo(self, post=".fits"):
         if post.startswith("."):
             fn = f"{self.telescope}_{self.instrument}_{self.project}_{self.obs_type}_{self.exp_start}_{self.exp_stop}_" \
-                 f"{self.obs_id}_{self.detector}_L1_V{self.version:02d}{post}"
+                 f"{self.obs_id}_{self.detector}_L1_V{self.version}{post}"
         else:
             fn = f"{self.telescope}_{self.instrument}_{self.project}_{self.obs_type}_{self.exp_start}_{self.exp_stop}_" \
-                 f"{self.obs_id}_{self.detector}_L1_V{self.version:02d}_{post}"
+                 f"{self.obs_id}_{self.detector}_L1_V{self.version}_{post}"
         return os.path.join(self.dir_out, fn)
 
     def fpi(self):