Oracle Linux rhel8stig_bootloader_path and RHEL-08-020030 fix

[BillSkiCO]

Addressing Oracle Linux distribution identification issue #239

Overall Review of Changes:

• Oracle Linux distribution was being incorrectly identified in the prelim.yml task
• RHEL-08-020030 related task fails if lock-enabled is already defined in dconf

Issue Fixes:
Resolves #239
Resolves #241

Enhancements:
N/A

How has this been tested?:

• Ansible 2.16
• Oracle Linux 8.8

1. Observed successful variable assignment of rhel8stig_bootloader_path to /boot/efi/EFI/redhat

TASK [ansible-lockdown.RHEL8-STIG : PRELIM | set fact if UEFI boot | Oracle Linux] *******
ok: [localhost] => {"ansible_facts": {"rhel8stig_bootloader_path": "/boot/efi/EFI/redhat", "rhel8stig_legacy_boot": false}, "changed": false}
...
...
...
TASK [ansible-lockdown.RHEL8-STIG : PRELIM | output bootloader and efi state] ************
ok: [localhost] => {
    "msg": [
        "bootloader path set to /boot/efi/EFI/redhat",
        "legacy boot equals False"
    ]
}

2. Observed successful enforcement of lock-enabled=true if lock-enabled was already implemented in dconf