Update payloads_not_blocked to host_not_blocked in report_generator.py

[ameliav]

🗣 Description

Update payloads_not_blocked to host_not_blocked in report_generator.py

💭 Motivation and context

"We expected the total payloads executed value to match the total number of Not Blocked's in the Host Protection Column of the payloads." Found in issue #65

🧪 Testing

I created the report a few times with different input values to determine that the result matched.

📷 Screenshots

The screenshot show that it is only capturing the total amount from host protection.

✅ Pre-approval checklist

• This PR has an informative and human-readable title.
• Changes are limited to a single goal - eschew scope creep!
• All future TODOs are captured in issues, which are referenced
  in code comments.
• All relevant type-of-change labels have been added.
• I have read the CONTRIBUTING document.
• These code changes follow cisagov code standards.
• All relevant repo and/or project documentation has been updated
  to reflect the changes in this PR.
• Tests have been added and/or modified to cover the changes in this PR.
• All new and existing tests pass.

✅ Pre-merge checklist

• Revert dependencies to default branches.
• Finalize version.

✅ Post-merge checklist

• Create a release.

[coveralls]

Pull Request Test Coverage Report for Build 6734918259

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 0.0%

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Totals
Change from base Build 6549233012:	0.0%
Covered Lines:	0
Relevant Lines:	0

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💛 - Coveralls

[schmelz21]

Approved.
@JCantu248 or @nickviola are you able to take a quick look?

[schmelz21]

FYI - as of now current report backlog = 8

[schmelz21]

@dav3r or @jsf9k - either one of you able to take a look?
It is a minor calculation change, and we have some reports on hold until we update. Thanks.

[nickviola]

LGTM