Add missing categories to AppNexus -> IAB mapping file. (#1264)

* Add missing categories to AppNexus -> IAB mapping file.

* Remove entry for category 38 which was set to a primary IAB category instead of a sub-category.

* Fix order of category 22

static/adapter/appnexus/opts.json

@@ -20,8 +20,11 @@
     "19": "IAB18-4",
     "20": "IAB1-5",
     "21": "IAB1-6",
+    "22": "IAB19-28",
     "23": "IAB19-13",
     "24": "IAB22-2",
+    "25": "IAB3-9",
+    "26": "IAB17-26",
     "27": "IAB19-6",
     "28": "IAB1-7",
     "29": "IAB9-5",
@@ -31,7 +34,6 @@
     "33": "IAB16-5",
     "34": "IAB19-34",
     "37": "IAB11-4",
-    "38": "IAB23",
     "39": "IAB9-30",
     "41": "IAB7-44",
     "51": "IAB17-12",