chatllm: fix model loading progress showing "Reload" sometimes (#2337)

Signed-off-by: Jared Van Bortel <jared@nomic.ai>

gpt4all-chat/chatllm.cpp

@@ -350,6 +350,7 @@ bool ChatLLM::loadModel(const ModelInfo &modelInfo)
                 }
 
                 m_llModelInfo.model->setProgressCallback([this](float progress) -> bool {
+                    progress = std::max(progress, std::numeric_limits<float>::min()); // keep progress above zero
                     emit modelLoadingPercentageChanged(progress);
                     return m_shouldBeLoaded;
                 });