User should be able to remove all cycles in the calendar's edit mode

[imblowfish]

Related task: #166

Steps:

• Launch app without any storage data (list of cycles should be empty)
• Click on Edit button
• Select any range of days
  
• Click on Save
  
• Click on Edit again
• Click on the same days to remove them, there shouldn't be any other selected days
  
• Click on Save
  

Expected result: You shouldn't see any days on the calendar's view mode, cycles list should be empty

To be sure that list of cycles is empty you can export config and check it by yourself. This config should look something like this:

{
  "version": 1,
  "cycles": [],
  "language": "en"
}