Savestate: Reset video frame tracking and ME busy time on load

Neither is serialized, and both went stale on load. The ME busy time was
measured against the pre-load clock, so loading an earlier state made the
next SAS/codec job wait until the old time came around, freezing the game.

Co-Authored-By: Claude Opus 5.5 (1M context) <[email protected]>

Core/HLE/sceVideocodec.cpp

@@ -187,6 +187,11 @@ void __VideocodecShutdown() {
 }
 
 void __VideocodecDoState(PointerWrap &p) {
+	if (p.mode == p.MODE_READ) {
+		// Not serialized, and the clock it was measured against just moved (maybe backwards).
+		g_meBusyUntilUs = 0;
+	}
+
 	auto s = p.Section("sceVideocodec", 0, 1);
 	if (!s) {
 		return;