FifoManager: Remove redundant PauseAndLock parameters

PauseAndLock was only called with do_lock=true, and the function only
used unpauseOnUnlock when do_lock was false.

Source/Core/DolphinQt/Host.cpp

@@ -106,7 +106,7 @@ static void RunWithGPUThreadInactive(std::function<void()> f)
     auto& system = Core::System::GetInstance();
     const bool was_running = Core::GetState(system) == Core::State::Running;
     auto& fifo = system.GetFifo();
-    fifo.PauseAndLock(true, was_running);
+    fifo.PauseAndLock();
     f();
     fifo.RestoreState(was_running);
   }