Disable ICache emulation for some games

Specifically, 'Scooby-Doo! Mystery Mayhem', 'Scooby-Doo! Unmasked', 'Ed, Edd n Eddy: The Mis-Edventures', and the Wii version of 'Happy Feet'.

The JIT cache causes problems with emulated icache invalidation in these games, resulting in areas failing to load.

Source/Core/Core/NetPlayServer.cpp

@@ -1331,6 +1331,7 @@ bool NetPlayServer::StartGame()
   spac << m_settings.m_PerfQueriesEnable;
   spac << m_settings.m_FPRF;
   spac << m_settings.m_AccurateNaNs;
+  spac << m_settings.m_DisableICache;
   spac << m_settings.m_SyncOnSkipIdle;
   spac << m_settings.m_SyncGPU;
   spac << m_settings.m_SyncGpuMaxDistance;