fix: rm hardcoded useIframe & captureConsole opts

[gnail]

These default options will override karma.conf.js even if they're explicitly set to false in there. This was kinda pointless anyway since Karma defaults these options to true anyway if they are not set.

Closes #165, #166

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[gnail]

I signed it!

[googlebot]

CLAs look good, thanks!

[gnail]

This PR will also close #128

[dignifiedquire]

Thanks will merge and release when the relevant karma PR is merged and released

[dignifiedquire]

@gnail in the meantime could you please change the commit message to follow our convention. Thanks

[gnail]

Ok I've updated the commit messages