fix: #542 in SwaggerODataSample

[spaasis]

$count was not enabled globally, so using it in queries caused a 400 error

[commonsensesoftware]

Thanks for spending the time on this. Honestly, I feel like this is a bug in OData. What's the purpose of using [EnableQuery] if it only works when you enable to the global query option? I can't really say, but it's worth adding this so it works.

Ultimately, this setting needs to be enabled in both the ASP.NET Core and Web API examples. I've taken the liberty of updating both. I just finishing merging the 4.0 bits so you should see it available now.

I'm going to close this PR as it's no longer necessary, but I referenced in my changes. Thanks.

[spaasis]

Oh right, didn't even think about the webapi side of things :)
Yeah, the config is quite confusing in OData. It's not too well documented either...
I opened this to see if it could be made a bit easier: OData/WebApi#1942

Cheers for the 4.0 release!