UJavascriptHttpRequest don't Need to be Ticked Manually

[hillin]

in UJavascriptHttpRequest, an FHttpProcessor is employed to tick the request. However, the request will be ticked by FHttpManager automatically, so there is no need to tick manually.

[nakosung]

I didn't know, thank you. Could you make a PR for this?

[hillin]

@nakosung sure, here it is.

[nakosung]

Thank you :)