Added missing minio-related conf

templates/nginx.conf.j2

@@ -109,6 +109,8 @@ server {
     # Comment the previous location and uncomment this one if you're storing
     # media files in a S3 bucket
     location ~ /_protected/media/(.+) {
+        # Needed to ensure DSub auth isn't forwarded to S3/Minio, see #932
+        proxy_set_header Authorization "";
         internal;
         proxy_pass $1;
     }