fix: Use correct name when logging EDGEX_CONF_DIR override

[lenny-goodell]

PR Checklist

Please check if your PR fulfills the following requirements:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

If your build fails due to your commit message not passing the build checks, please review the guidelines here: https://github.com/edgexfoundry/go-mod-bootstrap/blob/master/.github/Contributing.md.

What is the current behavior?

Logging for EDGEX_CONF_DIR override uses incorrect name envFile

Issue Number: #264

What is the new behavior?

Logging for EDGEX_CONF_DIR override uses correct name envConfDir

Does this PR introduce a breaking change?

• Yes
• No

New Imports

• Yes
• No

Specific Instructions

Are there any specific instructions or things that should be known prior to reviewing?

Other information

[codecov-commenter]

Codecov Report

Merging #266 (96e528d) into main (3e2f67e) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #266   +/-   ##
=======================================
  Coverage   58.90%   58.90%           
=======================================
  Files          12       12           
  Lines         786      786           
=======================================
  Hits          463      463           
  Misses        309      309           
  Partials       14       14           

Impacted Files	Coverage Δ
bootstrap/environment/variables.go	90.30% <100.00%> (ø)

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