Fixes issue #2105 by using the original url for the download. This fix is

valid because we expect the url to contain the actual filename at the end.
This also allows huggingface to track the download as happening.

Signed-off-by: Adam Treat <treat.adam@gmail.com>

gpt4all-chat/modellist.cpp

@@ -1922,7 +1922,7 @@ void ModelList::handleDiscoveryItemFinished()
     QString repoCommit = QString::fromUtf8(repoCommitHeader);
     QString linkedSize = QString::fromUtf8(linkedSizeHeader);
     QString linkedEtag = QString::fromUtf8(linkedEtagHeader);
-    QString url = locationHeader;
+
     QString modelFilename = reply->request().attribute(QNetworkRequest::UserMax).toString();
     QString modelFilesize = linkedSize;
     modelFilesize = ModelList::toFileSize(modelFilesize.toULongLong());
@@ -1953,7 +1953,7 @@ void ModelList::handleDiscoveryItemFinished()
         { ModelList::FilesizeRole, modelFilesize },
         { ModelList::DescriptionRole, description },
         { ModelList::IsDiscoveredRole, true },
-        { ModelList::UrlRole, url },
+        { ModelList::UrlRole, reply->request().url() },
         { ModelList::LikesRole, likes },
         { ModelList::DownloadsRole, downloads },
         { ModelList::RecencyRole, lastModified },