determine HSTDM n_file

csst_dag/dag/_dispatcher.py

@@ -693,8 +693,8 @@ class Dispatcher:
                 if this_instrument == "HSTDM":
                     # 不确定以后是1个探测器还是2个探测器
                     this_n_file_found = len(this_obsgroup_obsid_file)
-                    this_n_file_expected = (this_n_file, this_n_file * 2)
-                    this_success &= this_n_file_found in this_n_file_expected
+                    this_n_file_expected = this_n_file
+                    this_success &= this_n_file_found == this_n_file_expected
                 else:
                     # for other instruments, e.g., MSC
                     # n_file_found = len(this_obsgroup_obsid_file)