[BUG] BOM download shell script missing `:` colon in Ansible Collections Path

**Describe the bug**

BOM download shell script missing `:` colon in Ansible Collections Path

https://github.com/Azure/sap-automation/blob/main/deploy/ansible/download_menu.sh#L54

```
export           ANSIBLE_COLLECTIONS_PATH=/opt/ansible/collections   :    ${ANSIBLE_COLLECTIONS_PATH:+${ANSIBLE_COLLECTIONS_PATH}}
```