[RAPPS] Missing (re)initialization of download progress bar

reactos-bootcd-0.4.15-dev-4946-ge9a129c-x86-gcc-lin-dbg

RAPPS starts displaying download progress bar with the total size of the "previous" download until it gets the size of the new one.

Eg : download RAPPS db (420kb) then next download will start with an incorrect 100% 420kb / 420kb untile it gets full size.

This looks like a basic UI initialisation defect.

I'd suspect 

dwContentLen = InfoArray[iAppId].SizeInBytes;

in CDownloadManager::ThreadFunc https://github.com/reactos/reactos/blob/a6bf77e7b9adc1e20e7170a05f179f7e25b36653/base/applications/rapps/loaddlg.cpp#L815