[Ability][Checkup][Bug] Defeatist checkup + getHpRatio() precision improved

[frutescens]

What are the changes the user will see?

Getting damage for Flail will consider a HP ratio that has the same number of decimal places as listed in their conditions.
In random rewards, Potions and Hyper Potions will match the same number of decimal places as listed in their conditions too. Previously, the game cut all getHpRatio() requests to the hundredth place by default, causing issues for requests that were trying to match more precise values.

Why am I making these changes?

Ability Checkup.

What are the changes from a developer perspective?

pokemon.getHpRatio() has been replaced with getHpBarScaleX() in battle-info.ts, a helper function that suits the UI's need for a very precise decimal. pokemon.getHpRatio() now takes in an optional parameter precision that can increase the precision of the HP ratio calculated. It defaults to the hundredth place (precision value of 2) since most checks are limited to that, but now it is much more flexible and can be applied to other more precise checks.

Test for Defeatist created.

How to test the changes?

npm run test defeatist

Checklist

• I'm using beta as my base branch
• There is no overlap with another PR?
• The PR is self-contained and cannot be split into smaller PRs?
• Have I provided a clear explanation of the changes?
• Have I tested the changes manually?

• Are all unit tests still passing? (npm run test:silent)
  • Have I created new automated tests (npm run create-test) or updated existing tests related to the PR's changes?