ggpo: move endOfFrame() call back to start render

Naomi2 TA context geometry for the current frame is lost when
rollbacking during vblank in because it hasn't been queued for render
yet.
Fixes black screen after GGPO rollback for Naomi 2 games

core/emulator.cpp

@@ -928,7 +928,9 @@ void Emulator::vblank()
 	if (sh4_sched_now64() - startTime <= 10000000)
 		return;
 	renderTimeout = true;
-	if (!ggpo::active() && !config::ThreadedRendering)
+	if (ggpo::active())
+		ggpo::endOfFrame();
+	else if (!config::ThreadedRendering)
 		sh4_cpu.Stop();
 }
 

core/hw/pvr/Renderer_if.cpp

@@ -395,6 +395,9 @@ void rend_start_render()
 	ctx->rend.fog_clamp_min = FOG_CLAMP_MIN;
 	ctx->rend.fog_clamp_max = FOG_CLAMP_MAX;
 
+	if (!ctx->rend.isRTT)
+		ggpo::endOfFrame();
+
 	if (QueueRender(ctx))
 	{
 		palette_update();

core/hw/pvr/spg.cpp

@@ -113,7 +113,6 @@ static int spg_line_sched(int tag, int cycles, int jitter)
 				SB_MDST = 0;
 			}
 			asic_RaiseInterrupt(holly_SCANINT1);
-			ggpo::endOfFrame();
 		}
 
 		if (SPG_VBLANK_INT.vblank_out_interrupt_line_number == prv_cur_scanline)