Do not round up pool token balance

[jo-elimu]

The UI at https://rewards.elimu.ai/sushiswap for depositing pool tokens might in some cases display a larger number than the actual balance.

Example: The UI shows 53.64 and the user copies that number into the amount field:

While the exact balance might be slightly lower (53.638):

Fix this by rounding down instead of up. So in the example above, the UI should display the number 53.63 instead of 53.64.