Update ability.ts (#910)

Water bubble should double the damage of water moves. The current multiplier in-game is x1.

src/data/ability.ts

@@ -3456,7 +3456,7 @@ export function initAbilities() {
       .attr(MovePowerBoostAbAttr, (user, target, move) => user.scene.currentBattle.turnCommands[target.getBattlerIndex()].command === Command.POKEMON, 2),
     new Ability(Abilities.WATER_BUBBLE, 7)
       .attr(ReceivedTypeDamageMultiplierAbAttr, Type.FIRE, 0.5)
-      .attr(MoveTypePowerBoostAbAttr, Type.WATER, 1)
+      .attr(MoveTypePowerBoostAbAttr, Type.WATER, 2)
       .attr(StatusEffectImmunityAbAttr, StatusEffect.BURN)
       .ignorable(),
     new Ability(Abilities.STEELWORKER, 7)