The label images cannot be displayed on Web

**Describe the bug**
I use the MinIO as the Label Studio Data Storage, and the label images were successfully uploaded using Minio, but they cannot be displayed on the page.

In Label Studio Project Web Page, I found the 'image' filed in task is erro.


The MinIO Console information:

**To Reproduce**
The 'docker-compose.yml':
``` yaml
app:
stdin_open: true
tty: true
build: .
image: heartexlabs/label-studio:latest
restart: unless-stopped
expose:
- "8000"
depends_on:
- db
environment:
- DJANGO_DB=default
- POSTGRE_NAME=postgres
- POSTGRE_USER=postgres
- POSTGRE_PASSWORD=
- POSTGRE_PORT=5432
- POSTGRE_HOST=db
- LABEL_STUDIO_HOST=${LABEL_STUDIO_HOST:-}
- JSON_LOG=1
- LOG_LEVEL=DEBUG
- MINIO_STORAGE_ACCESS_KEY=${MINIO_ROOT_USER:-minio_admin_do_not_use_in_production}
- MINIO_STORAGE_SECRET_KEY=${MINIO_ROOT_PASSWORD:-minio_admin_do_not_use_in_production}
- MINIO_STORAGE_BUCKET_NAME=data
- MINIO_STORAGE_ENDPOINT=http://minio:9000
volumes:
- /home/zhouli/docker/labeling_192/mydata:/label-studio/data:rw
command: label-studio-uwsgi
```

**Expected behavior**
Successfully displayed on the page.

**Screenshots**
If applicable, add screenshots to help explain your problem.

**Environment (please complete the following information):**
- OS: Ubuntu 18.04
- label studio tag 1.9.2