fix: Inverted condition for option http-proxy-auth
fix: Inverted condition for option http-proxy-auth

The condition was inverted.
When no http-proxy-auth was given, the wget was using authentication which resulted in broken http_proxy option such as:
-e http_proxy=@http://my.proxy:8080

phpbrew/phpbrew,morozov/phpbrew,phpbrew/phpbrew,morozov/phpbrew,phpbrew/phpbrew