Fix reference (follow !3919)

Det/VPDet/tests/data/velo_motion_from_yaml_pyconf.ref

 /***** User ApplicationOptions/ApplicationOptions **************************************************
-|-preamble_algs                           = []  (default: [])
 |-append_decoding_keys_to_output_manifest = True  (default: True)
 |-auditors                                = []  (default: [])
 |-buffer_events                           = 20000  (default: 20000)
@@ -30,6 +29,7 @@
 |-output_manifest_file                    = ''  (default: '')
 |-output_type                             = ''  (default: '')
 |-phoenix_filename                        = ''  (default: '')
+|-preamble_algs                           = []  (default: [])
 |-print_freq                              = 10000  (default: 10000)
 |-python_logging_level                    = 20  (default: 20)
 |-require_specific_decoding_keys          = []  (default: [])