Fix param for getRunnerName

[christian-bromann]

Proposed changes

Set proper param for getRunnerName.

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)

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

[codecov]

Codecov Report

Merging #3420 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3420   +/-   ##
=======================================
  Coverage   97.28%   97.28%           
=======================================
  Files         131      131           
  Lines        2911     2911           
  Branches      633      633           
=======================================
  Hits         2832     2832           
  Misses         74       74           
  Partials        5        5

Impacted Files	Coverage Δ
packages/wdio-cli/src/interface.js	98.05% <ø> (ø)	⬆️

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