Merge pull request #14110 from jordan-woyak/mgba-joybus-threading

HW/GBACore: Adjust joybus interthread communication to use WorkQueueThreadSP.

Source/Core/Common/WorkQueueThread.h

@@ -98,6 +98,8 @@ public:
       m_items.WaitForEmpty();
   }
 
+  bool IsRunning() { return m_thread.joinable(); }
+
 private:
   using CommandFunction = std::function<void()>;
 
@@ -142,8 +144,6 @@ private:
       return std::lock_guard{m_mutex};
   }
 
-  bool IsRunning() { return m_thread.joinable(); }
-
   void ThreadLoop(const std::string& thread_name, const FunctionType& function)
   {
     Common::SetCurrentThreadName(thread_name.c_str());