fix(runner): Fix getting result by config

[ilgonmic]

Since Karma 4.4.0, there is problem with exit code with failOn* properties, because now getResults expect only config, but emitting include concrete properties from config.
So it seems that all the failOn* properties don't work in 4.4.0

[AppVeyorBot]

❌ Build karma 2421 failed (commit fd31579fd2 by @ilgonmic)

[karmarunnerbot]

✅ Build karma 23 completed (commit fd31579fd2 by @ilgonmic)

[karmarunnerbot]

✅ Build karma 22 completed (commit fd31579fd2 by @ilgonmic)

[johnjbarton]

Thanks! Can you add a test to prevent such a fail? I wonder why our tests did not catch it.

[johnjbarton]

Looks there is no unit test coverage for that function

[ilgonmic]

I’ll watch on this and try to cover these cases

[johnjbarton]

I think I have coverage for this case now. just getting that last case to pass....

[johnjbarton]

I added a test that covers this case thus also your fix, PR #3384 , please review.

I'm happy to comment out the test and commit if you want to land this PR.

[ilgonmic]

@johnjbarton It does not matter for me :)
I think, I can close this PR in favor of #3384