[wpilibc] Fix DataLogManager crash on exit in sim (#5125)

wpilibc/src/main/native/cpp/DataLogManager.cpp

@@ -26,6 +26,7 @@ namespace {
 
 struct Thread final : public wpi::SafeThread {
   Thread(std::string_view dir, std::string_view filename, double period);
+  ~Thread() override;
 
   void Main() final;
 
@@ -94,6 +95,10 @@ Thread::Thread(std::string_view dir, std::string_view filename, double period)
   StartNTLog();
 }
 
+Thread::~Thread() {
+  StopNTLog();
+}
+
 void Thread::Main() {
   // based on free disk space, scan for "old" FRC_*.wpilog files and remove
   {