Add Support to the basic satellite.json file for GOES-18

[creinemann]

add support for GOES-18 to sattellite.json

  {
    "DisplayName": "GOES-18",
    "FilenamePrefix": "GOES18_FD_CH13_(?!enhanced)",
    "FilenameParser": "Goesproc",
    "Longitude": -137.2,
    "Brightness": 0.95
  },