IOS/NCD: Implement Lock/Unlock more accurately

NCD returns an error if it receives a request to lock the driver
when it is already locked.

Emulating this may seem pointless, but it turns out PPC-side code
expects NCD to return an error and will immediately fail and stop
initialising wireless stuff if NCD succeeds.

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 = 126;  // Last changed in PR 9348
+constexpr u32 STATE_VERSION = 127;  // Last changed in PR 9300 (temp)
 
 // Maps savestate versions to Dolphin versions.
 // Versions after 42 don't need to be added to this list,