Change the default value of detect_draw_by_insufficient_mating_material

[nodchip]

detect_draw_by_insufficient_mating_material option detects draw earlier. We will change the default values of detect_draw_by_insufficient_mating_material. Before we change them, we need the following experiments:

1. Generate training data with detect_draw_by_insufficient_mating_material = 0.
2. Train a net with 1.
3. Generate training data with detect_draw_by_insufficient_mating_material = 1.
4. Train a net with 3.
5. Compare the elo between 2. and 4.

Any helps are welcome.