test: Make intervention test Edge friendly

[kblok]

All tests are green when running against Microsoft Edge Insider, except this test.

Edge returns https://to-be-replaced.invalid/feature/5718547946799104 instead of https://www.chromestatus.com/feature/5718547946799104

I think that checking for feature/5718547946799104 is a small test and will do the job for both browsers.

$env:CHROME = "C:\Program Files (x86)\Microsoft\Edge Dev\Application\msedge.exe"; node
.\test.js

[aslushnikov]

Thanks!