fix(semester-scope): meeting date scoped with DateTime caused day overlap

So a scope with DateTime 2019-12-01T00:00:00.0000Z turned out to match
hour meeting date 2019-11-30. Converting that DateTime to date solved the problem.

app/models/hour.rb

@@ -65,8 +65,8 @@ class Hour < ApplicationRecord
   scope :semester_with_date, lambda { |date|
     date_between_inclusion(
       :meeting_date,
-      date,
-      date.advance(months: BillingExpense::SEMESTER_LENGTH)
+      date.to_date,
+      date.advance(months: BillingExpense::SEMESTER_LENGTH).advance(days: -1).to_date
     )
   }