fix: bmodel_dis multi-subnet overwrite

-as title said

Change-Id: Iac85b6328df09c7c24b73318e60fb00621bd1c1f

Author: PostMalone1998

python/tools/bmodel_dis.py

@@ -68,7 +68,7 @@ class FName:
         def __str__(self):
             import os
             filename = os.path.basename(bmodel_file)
-            return filename.split(".")[0] + f"{self.suffix}.{self.core_id}"
+            return filename.split(".")[0] + f"_subnet{self.subnet_id}{self.suffix}.{self.core_id}"
 
     fname = FName()
     bmodel = dis.BModel(bmodel_file)