Fix isDisplayed in devtools

[mgrybyk]

Proposed changes

fix isDisplayed, fixes #4475

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

Checklist

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

Further comments

Reviewers: @webdriverio/technical-committee

[christian-bromann]

👍

[codecov]

Codecov Report

Merging #4477 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master    #4477   +/-   ##
=======================================
  Coverage   99.26%   99.26%           
=======================================
  Files         188      188           
  Lines        4755     4755           
  Branches     1016     1016           
=======================================
  Hits         4720     4720           
  Misses         32       32           
  Partials        3        3

Impacted Files	Coverage Δ
...es/webdriverio/src/commands/element/isDisplayed.js	100% <100%> (ø)	⬆️

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