[MC-271556] The drop rate of wither skeleton skulls is lowered by 0.01

The bug

The part that defines the drop rate of wither skeleton skulls in wither skeleton's loot table is as following:

{
  "bonus_rolls": 0.0,
  "conditions": [
    {
      "condition": "minecraft:killed_by_player"
    },
    {
      "chance": {
        "type": "minecraft:linear",
        "base": 0.025,
        "per_level_above_first": 0.01
      },
      "condition": "minecraft:random_chance_with_enchanted_bonus",
      "enchantment": "minecraft:looting"
    }
  ],
  "entries": [
    {
      "type": "minecraft:item",
      "name": "minecraft:wither_skeleton_skull"
    }
  ],
  "rolls": 1.0
}

From what I have learned in this snapshot, "base": 0.025 means that the chance of dropping the skull when using level 1 looting is 0.025, which was 0.035 in the previous versions. And we can assume that the whole drop rate of the skull is lowered by 0.01.