Citra-Qt: Use Core::RunLoop when not single stepping.

src/citra_qt/bootmanager.cpp

@@ -33,21 +33,18 @@ void EmuThread::run()
     stop_run = false;
     while (!stop_run)
     {
-        for (int tight_loop = 0; tight_loop < 10000; ++tight_loop)
+        if (cpu_running)
         {
-            if (cpu_running || exec_cpu_step)
+            Core::RunLoop();
+        } 
+        else if (exec_cpu_step)
         {
-                if (exec_cpu_step)
             exec_cpu_step = false;
-
             Core::SingleStep();
-                if (!cpu_running) {
             emit CPUStepped();
             yieldCurrentThread();
         }
     }
-        }
-    }
     render_window->moveContext();
 
     Core::Stop();