Fix early context cancellation when downloading/previewing object (#1846)

* Fix early context cancellation when downloading/previewing object
Signed-off-by: Daniel Valdivia <18384552+dvaldivia@users.noreply.github.com>

Author: dvaldivia

restapi/user_objects.go

@@ -367,8 +367,8 @@ func parseRange(s string, size int64) ([]httpRange, error) {
 }
 
 func getDownloadObjectResponse(session *models.Principal, params user_api.DownloadObjectParams) (middleware.Responder, *models.Error) {
-	ctx, cancel := context.WithCancel(context.Background())
-	defer cancel()
+	ctx := context.Background()
+
 	var prefix string
 	mClient, err := newMinioClient(session)
 	if err != nil {
@@ -468,8 +468,8 @@ func getDownloadObjectResponse(session *models.Principal, params user_api.Downlo
 	}), nil
 }
 func getDownloadFolderResponse(session *models.Principal, params user_api.DownloadObjectParams) (middleware.Responder, *models.Error) {
-	ctx, cancel := context.WithCancel(context.Background())
-	defer cancel()
+	ctx := context.Background()
+
 	var prefix string
 	mClient, err := newMinioClient(session)
 	if params.Prefix != "" {