DVDInterface/DVDThread: Don't store CoreTiming event IDs in savestates

CoreTiming event types aren't guaranteed to be stable across
runs of Dolphin, so they shouldn't be in savestates.

Source/Core/Core/State.cpp

@@ -71,7 +71,7 @@ static Common::Event g_compressAndDumpStateSyncEvent;
 static std::thread g_save_thread;
 
 // Don't forget to increase this after doing changes on the savestate system
-static const u32 STATE_VERSION = 52; // Last changed in PR 3667
+static const u32 STATE_VERSION = 53; // Last changed in PR 3759
 
 // Maps savestate versions to Dolphin versions.
 // Versions after 42 don't need to be added to this list,