[CT-679] flip logic around reset color detection

[darin-reify]

• this makes is so that the reset color code won't be appended to logs
  when use-colors is false.

resolves #5288

Checklist

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• I have run this code in development and it appears to resolve the stated issue
• This PR includes tests, or tests are not required/relevant for this PR
• I have opened an issue to add/update docs, or docs changes are not required/relevant for this PR
• I have run changie new to create a changelog entry

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[cla-bot]

Thanks for your pull request, and welcome to our community! We require contributors to sign our Contributor License Agreement and we don't seem to have your signature on file. Check out this article for more information on why we have a CLA.

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[gshank]

Darin: Can you sign one of the CLAs which is linked from https://docs.getdbt.com/docs/contributing/contributor-license-agreements? We can get this processed once that's done. Thanks!

[darin-reify]

Darin: Can you sign one of the CLAs which is linked from https://docs.getdbt.com/docs/contributing/contributor-license-agreements? We can get this processed once that's done. Thanks!

hey there, sorry was just crossing my t's and dotting my i's. i've signed the agreement!

[gshank]

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