SCI: Fix too-fast rendering

Now that the renderer is loading resources without spinning CPU time
on decompression every frame, it becomes apparent that kFrameOut is
spammed constantly by the interpreter and needs to be throttled to
ensure that transitions and fades work properly.

engines/sci/engine/kgraphics32.cpp

@@ -127,6 +127,8 @@ reg_t kGetHighPlanePri(EngineState *s, int argc, reg_t *argv) {
 reg_t kFrameOut(EngineState *s, int argc, reg_t *argv) {
 	bool showBits = argc > 0 ? argv[0].toUint16() : true;
 	g_sci->_gfxFrameout->kernelFrameout(showBits);
+	s->speedThrottler(16);
+	s->_throttleTrigger = true;
 	return NULL_REG;
 }