debsums: changing default checking as it will fail on base-files

[igorpecovnik]

Description

Base files are changed during the process. We already planned to set this off by default but conditions || and && got mixed. Debsums authors recommends to use other tools anyway:

If you are looking for an integrity checker that can run from safe media, do integrity checks on checksum databases and can be easily configured to run periodically to warn the admin of changes see other tools such as: aide, integrit, samhain, or tripwire.

FORCE_CHECK_MD5_PACKAGES=yes turns checking back on.

Closing #7048

How Has This Been Tested?

• Error with enable, no error with this fix

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules