[cli] Fix swapped error messages in executeBuild

[lobsterkatie]

This fixes two error messages which appear, based on the if-conditions to which they're respectively attached,
to have been swapped.

Related Issues

None, because this is a tiny change, but I can make one if you'd like me to.

📋 Checklist

Tests

• The code changed/added as part of this PR has been covered with tests
• All tests pass locally with yarn test-unit

Code Review

• This PR has a concise title and thorough description useful to a reviewer
• Issue from task tracker has a link to this PR (not sure what to do with this one)

[styfle]

Thanks!

[codecov]

Codecov Report

Merging #6724 (a6336b0) into main (b8f8289) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #6724   +/-   ##
=======================================
  Coverage   55.03%   55.03%           
=======================================
  Files          85       85           
  Lines        3594     3594           
  Branches      830      830           
=======================================
  Hits         1978     1978           
  Misses       1610     1610           
  Partials        6        6           

Impacted Files	Coverage Δ
packages/cli/src/util/dev/builder.ts	66.66% <ø> (ø)

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[TooTallNate]

Nice catch!