Fix connection details setting for multiremote in selenium server

[christian-bromann]

Proposed changes

Fixes: #6652

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)
• I have added proper type definitions for new commands (if appropriate)

Further comments

Reviewers: @webdriverio/project-committers

[christian-bromann]

@erwinheitzman I refined the types. I need to check twice because in the first time I need to decided whether to get the capabilities from a multiremote object vs. a set of caps and second I need to decide to attach the new options to the caps directly or to the multiremote options. I don't see a better way to do this.

[wswebcreation]

LGTM