Increase aspiration window for drop variants

Increase aspiration window for drop variants

crazyhouse STC (failed)
LLR: -2.97 (-2.94,2.94) [0.00,10.00]
Total: 3614 W: 1727 L: 1775 D: 112
http://www.variantfishtest.org:6543/tests/view/5deec1876e23db1ffe4a28be

crazyhouse LTC
LLR: 2.95 (-2.94,2.94) [0.00,10.00]
Total: 3726 W: 1863 L: 1711 D: 152
http://www.variantfishtest.org:6543/tests/view/5deeca6e6e23db1ffe4a28ca

crazyhouse VLTC
LLR: 2.96 (-2.94,2.94) [0.00,10.00]
Total: 11893 W: 5810 L: 5541 D: 542
http://www.variantfishtest.org:6543/tests/view/5df095f66e23db1ffe4a28d8