Tweak shogi piece values

Tweak shogi piece values

shogi STC
LLR: 2.96 (-2.94,2.94) [0.00,10.00]
Total: 3164 W: 1651 L: 1503 D: 10
http://www.variantfishtest.org:6543/tests/view/5fda7bcd6e23db221d9e9563

shogi LTC
LLR: 2.95 (-2.94,2.94) [0.00,10.00]
Total: 1540 W: 828 L: 704 D: 8
http://www.variantfishtest.org:6543/tests/view/5fdb06a26e23db221d9e956b

minishogi STC
LLR: 2.95 (-2.94,2.94) [-10.00,5.00]
Total: 3084 W: 1565 L: 1519 D: 0
http://www.variantfishtest.org:6543/tests/view/5fda82406e23db221d9e9568

makruk STC
LLR: 2.97 (-2.94,2.94) [-10.00,5.00]
Total: 7074 W: 598 L: 576 D: 5900
http://www.variantfishtest.org:6543/tests/view/5fdb32106e23db221d9e956f