don't use .to_i to avoid different usec being considered equal

[pesta]

✍️ Description

(required) Please include any relevant details about this Pull Request, with a focus on:

• What does it fix.
  Different times being considered equal.

ApplicationRecord.connection.execute("CREATE TABLE models (id UUID, my_date TIMESTAMP)")

class Model < ApplicationRecord
  validates :my_date, date: { equal_to: ->(model) { model.my_date.end_of_day } }
end

model = Model.new
model.my_date = Time.current.end_of_day.change(usec: 0)
model.valid? # true
model.my_date == model.my_date.end_of_day # false

• Why did you do things this way.
  The previous implementation used .to_i to compare dates, this lead to a bug where a model would pass validation without actually being valid.

• How does it fix the issue at hand.
  Just changed the implementation to compare dates without .to_i

Based on the test suite, it looks fine.