attribute "next month" shows month regardless of year

[rzw]

Bug Report

App Version: 2.0.14

Platform: Windows

Installation Method: Direct Download

Expected Behavior: Just show todos of next month

Actual Behavior: Shows todos in the respective month of any year

Steps to Reproduce:

1. Open the app.
2. Create tasks in the next month and next month in a year from now
3. Filter by attribute "next month"
4. Have todos of coming and previous years shown as well

Screenshots: not necessary