refactor: change if in else to else if

[noritaka1166]

What kind of change does this PR introduce?
refactoring

Did you add tests for your changes?
no

If relevant, did you update the documentation?
no

Summary
change if in else to else if for better readability

Does this PR introduce a breaking change?
no

Other information

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.93%. Comparing base (31f634a) to head (97a0bc3).
Report is 245 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4470      +/-   ##
==========================================
- Coverage   90.18%   89.93%   -0.26%     
==========================================
  Files          22        9      -13     
  Lines        1702     1411     -291     
  Branches      491      460      -31     
==========================================
- Hits         1535     1269     -266     
+ Misses        167      142      -25     

Files with missing lines	Coverage Δ
packages/configtest/src/index.ts	93.10% <100.00%> (-3.33%)	⬇️

... and 3 files with indirect coverage changes

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[evenstensberg]

I think we could shorten this statement more, but for now lgtm