Argument type mismatch in log messages about loaded VATSIM server file

[ltoenning]

The log function for the server file expects the argument as number of lines:

https://github.com/swift-project/pilotclient/blob/7e6f3f0f0d8bda6ec082f0947a6cf69dae4fc7c3/src/blackcore/webdataservices.cpp#L1350-L1353

but the argument of the signal triggering this slot is kilobytes:

https://github.com/swift-project/pilotclient/blob/7e6f3f0f0d8bda6ec082f0947a6cf69dae4fc7c3/src/blackcore/vatsim/vatsimserverfilereader.h#L53-L55

As the input file is in JSON format, the number of lines also doesn't really make sense here. Further, as the server file is pretty small and the conversion to kilobytes is handled as an integer division, the result is always 0. Maybe the argument should be passed as double/float instead.