fix: bump the response header timeout for forwarder as well (#9994)

continuation of #9986, add more place where the lower timeout
comes into effect.

cmd/web-handlers.go

@@ -632,7 +632,7 @@ func (web *webAPIHandlers) RemoveObject(r *http.Request, args *RemoveObjectArgs,
 			}
 			return toJSONError(ctx, err, args.BucketName)
 		}
-		core, err := getRemoteInstanceClient(r, getHostFromSrv(sr))
+		core, err := getRemoteInstanceClientLongTimeout(r, getHostFromSrv(sr))
 		if err != nil {
 			return toJSONError(ctx, err, args.BucketName)
 		}