modules/sca: fix 180 replies in sca_call_info_invite_reply_18x_handler()

    - Per Broadworks Release 13.0v1 documentation, 180s should produce
      "appearance-state=progressing" just like 183s do; Polycom OS 3.3.4
      doesn't care, but 4.x swaps leg information when it hears
      "appearance-state=alerting"
    - report and patch from  Joao Vitor Arruda