fix default configs being exported as a singleton

[naorzr]

Proposed changes

This pr is suppose to fix this bug issue #4922.

Types of changes

• Bugfix (non-breaking change which fixes an issue)

Checklist

• I have added tests that prove my fix is effective or that my feature works
• I have read the CONTRIBUTING doc
• I have added necessary documentation (if appropriate)
• I have added proper type definitions for new commands (if appropriate)

Further comments

Reviewers: @webdriverio/technical-committee

[jsf-clabot]

Thank you for your submission, we really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.

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[codecov]

Codecov Report

Merging #4923 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master    #4923   +/-   ##
=======================================
  Coverage   99.39%   99.39%           
=======================================
  Files         210      210           
  Lines        5486     5486           
  Branches     1200     1200           
=======================================
  Hits         5453     5453           
  Misses         30       30           
  Partials        3        3

Impacted Files	Coverage Δ
packages/wdio-config/src/constants.js	100% <ø> (ø)	⬆️
packages/wdio-config/src/lib/ConfigParser.js	99.13% <100%> (ø)	⬆️

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[christian-bromann]

One comment otherwise LGTM