rtmp-services: Remove extraneous comma in schema

plugins/rtmp-services/data/schema/service-schema-v5.json

@@ -26,7 +26,7 @@
                             "FTL",
                             "SRT",
                             "RIST",
-                            "WHIP",
+                            "WHIP"
                         ]
                     },
                     "common": {