Clean up repetitive declarations for see_ge

The occupied bitboard is only used in one place and is otherwise thrown away.
To simplify use, see_ge function can instead be overloaded.
Repetitive declarations for occupied bitboard can be removed.

Passed non-regression test
https://tests.stockfishchess.org/tests/view/6421c286db43ab2ba6f908eb
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 48912 W: 13196 L: 13001 D: 22715
Ptnml(0-2): 146, 5003, 13967, 5190, 150

closes https://github.com/official-stockfish/Stockfish/pull/4469

No functional change.

src/movepick.h

@@ -150,7 +150,6 @@ private:
   Value threshold;
   Depth depth;
   ExtMove moves[MAX_MOVES];
-  Bitboard occupied;
 };
 
 } // namespace Stockfish