fix bad url in staging env

Author: Amoki

Diff for: config/configuration.js

@@ -28,7 +28,7 @@ module.exports = {
   tasksPerProcess: process.env.TASKS_PER_PROCESS,
 
   pdfHydraterUrl: process.env.PDF_HYDRATER_URL || defaultPdfHydraterUrl,
-  officeHydraterUrl: process.env.SELF_URL || defaultOfficeHydraterUrl,
+  officeHydraterUrl: process.env.SELF_URL || process.env.OFFICE_HYDRATER_URL || defaultOfficeHydraterUrl,
 
   redisUrl: process.env.REDIS_URL,
   appName: process.env.APP_NAME || "office-hydrater",