Undo most of ZzZombo's changes

- "If it ain't broke, don't fix it."
- Some of the changes were downright wrong and some were pointless, so undo
  everything that doesn't look like an actual improvement.

src/b_bot.cpp

@@ -61,8 +61,8 @@ void DBot::Serialize (FArchive &arc)
 
 	if (SaveVersion < 4515)
 	{
-		angle_t savedyaw=0;
-		int savedpitch=0;
+		angle_t savedyaw;
+		int savedpitch;
 		arc << savedyaw
 			<< savedpitch;
 	}