core_timing: Use higher precision sleeps on Windows

The precision of sleep_for and wait_for is limited to 1-1.5ms on Windows.
Using SleepForOneTick() allows us to sleep for exactly one interval of the current timer resolution.
This allows us to take advantage of systems that have a timer resolution of 0.5ms to reduce CPU overhead in the event loop.

src/video_core/gpu.cpp

@@ -197,7 +197,7 @@ struct GPU::Impl {
         constexpr u64 gpu_ticks_num = 384;
         constexpr u64 gpu_ticks_den = 625;
 
-        u64 nanoseconds = system.CoreTiming().GetGlobalTimeNs().count();
+        u64 nanoseconds = system.CoreTiming().GetCPUTimeNs().count();
         if (Settings::values.use_fast_gpu_time.GetValue()) {
             nanoseconds /= 256;
         }