Fix up model names that don't begin with 'ggml-'

gpt4all-chat/chat.cpp

@@ -412,7 +412,8 @@ QList<QString> Chat::modelList() const
         for (const QString& f : fileNames) {
             QString filePath = exePath + f;
             QFileInfo info(filePath);
-            QString name = info.completeBaseName().remove(0, 5);
+            QString basename = info.completeBaseName();
+            QString name = basename.startsWith("ggml-") ? basename.remove(0, 5) : basename;
             if (info.exists()) {
                 if (name == currentModelName)
                     list.prepend(name);

gpt4all-chat/qml/ModelDownloaderDialog.qml

@@ -83,7 +83,7 @@ Dialog {
                         id: modelName
                         objectName: "modelName"
                         property string filename: modelData.filename
-                        text: !modelData.isChatGPT ? filename.slice(5, filename.length - 4) : filename
+                        text: !modelData.isChatGPT ? (filename.startsWith("ggml-") ? filename.slice(5, filename.length - 4) : filename.slice(0, filename.length - 4)) : filename
                         padding: 20
                         anchors.top: parent.top
                         anchors.left: parent.left