VideoCommon: use Quaternion for Free Look orientation

Source/Core/Core/State.cpp

@@ -74,7 +74,7 @@ static Common::Event g_compressAndDumpStateSyncEvent;
 static std::thread g_save_thread;
 
 // Don't forget to increase this after doing changes on the savestate system
-constexpr u32 STATE_VERSION = 127;  // Last changed in PR 9300
+constexpr u32 STATE_VERSION = 128;  // Last changed in PR 9366
 
 // Maps savestate versions to Dolphin versions.
 // Versions after 42 don't need to be added to this list,