`find` performs search on fields aside from the description or category of item

[rizemon]

According to the example, it says that the command finds the keyword in the description or categories of expenses/income entries. However, the command also finds the keyword in the amount field as well.

Despite the description and category not containing 69, it still returned my expense that had 69 in its amount.

Input: add_ex d/some-thing a/69.69 c/Food, find 69