Applicationurl shouldn't randomly generate port 5060 or 5061

[sammychinedu2ky]

I noticed a little error. Port 5060 and 5061 aren't allowed by new browser versions due to the natslip attack (https://chromestatus.com/feature/5064283639513088). Port 5060 was randomly created for me in the launchSettings.json file which made me have issues accessing my API from the browser. I had to change the applicationUrl port manually.

if I can be shown the line where the port generation is done in the dotnet SDK, I would also appreciate it. Thanks