Fix default thread setting.

gpt4all-chat/mysettings.cpp

@@ -350,6 +350,10 @@ int MySettings::threadCount() const
     QSettings setting;
     setting.sync();
     int c = setting.value("threadCount", default_threadCount).toInt();
+    // The old thread setting likely left many people with 0 in settings config file, which means
+    // we should reset it to the default going forward
+    if (c <= 0)
+        c = default_threadCount;
     c = std::max(c, 1);
     c = std::min(c, QThread::idealThreadCount());
     return c;