Enhance king protector term for drop variants

Enhance king protector term for drop variants

shogi
LLR: 2.97 (-2.94,2.94) [0.00,10.00]
Total: 1354 W: 713 L: 594 D: 47

euroshogi
LLR: 2.97 (-2.94,2.94) [-10.00,5.00]
Total: 574 W: 307 L: 245 D: 22

minishogi
LLR: 2.95 (-2.94,2.94) [-10.00,5.00]
Total: 2006 W: 950 L: 901 D: 155

crazyhouse STC
LLR: 2.96 (-2.94,2.94) [-10.00,5.00]
Total: 855 W: 449 L: 388 D: 18
http://35.161.250.236:6543/tests/view/5bf981d86e23db7639060cab

crazyhouse LTC
LLR: 2.98 (-2.94,2.94) [-10.00,5.00]
Total: 2573 W: 1284 L: 1235 D: 54
http://35.161.250.236:6543/tests/view/5bfa5e486e23db7639060cae