cellSearch: Change search state before invoking callbacks

[CookiePLMonster]

It makes sense to change cellSearch state before invoking an user callback, since it acts as a broadcast for state change. WipEout HD uses those callbacks to start a new search, which would errorerously fail due to cellSearch still being "busy".

This "fixes" WipEout HD's searches failing - since it relies on yet unimplemented playlists, custom songs still don't work but now the game thinks search has succeeded and found 0 entries (instead of failing).

[Tom-Neverwinter]

Thank you!!!

[Augusto7743]

rpcs3-v0.0.9-10120
WipEout HD Demo using :

• LLVM first start crash before begin the race and second start crash rpcs3 when loading the game.
• ASMJIT game run normally using SPU Safe and not need configure driver wake up delay to 250 us.
  Gameplay not totally tested because the slow gameplay speed.

[CookiePLMonster]

I tested on latest and was able to get to the race without any issues.

https://cdn.discordapp.com/attachments/442667232489897997/696983979630526465/unknown.png

Your issues are not related to this PR, especially given that cellSearch only runs on startup and not when you are entering the race (I think).

EDIT:
One important note is that I did not update my game - it's still on 01.26.