Update proxySettings.json

Author: skiesofravens

proxySettings.json

@@ -132,7 +132,6 @@
     "mus": "x-world/x-d96",
     "mwc": "application/vnd.dpgraph",
     "mwf": "application/x-mwf",
-    "nhn": "text/html",
     "nmo": "application/x-virtools",
     "nms": "application/x-virtools",
     "p3d": "application/x-p3d",