Update spatialos.UnityWorker.worker.json

Renames"receptionistIp" to "receptionistHost".

Author: samc-improbable

workers/unity/spatialos.UnityWorker.worker.json

@@ -34,7 +34,7 @@
       "arguments": [
         "+projectName",
         "${IMPROBABLE_PROJECT_NAME}",
-        "+receptionistIp",
+        "+receptionistHost",
         "${IMPROBABLE_RECEPTIONIST_HOST}",
         "+receptionistPort",
         "${IMPROBABLE_RECEPTIONIST_PORT}",