Realy fixed spectator mouse now

I revived e481553 commit back, add invert support (`if (!cg_invertMouseY) y = y;`) and applied this to all spectator mode. 
Commented condition is unnecessary now. 

Now both spectator modes behaves exactly like in Ace of Spades.
Update Client.cpp

Reverted to Toumal code, but now it's applied to all spec modes.
Merge pull request #151 from noway421/patch-1

Realy fixed spectator mouse now