fix: limit the number of days in rollback-helper

[befanyt]

This PR introduces a limitation on the date selection in ublue-rollback-helper, restricting the available options to the last 31 days.

As outlined in issue #1821, the current implementation allows users to select from all available dates, which currently totals around 176 options. This extensive list will 'overflow' and results in showing only old dates to the user.

By limiting the date range to the last 31 days, we can prevent this overflow issue, ensuring that users have a manageable selection that is sufficient for pinpointing specific issues via the date picker.

Current behavior

Which Tag would you like to rebase to?
The default selection is gts, stable (weekly builds) and stable-daily (daily builds) are for enthusiasts, and latest is for testers
Warning: This will pin you to a specific version, do not forget to rebase back to a channel to resume receiving updates.
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New behavior

Which Tag would you like to rebase to?
The default selection is gts, stable (weekly builds) and stable-daily (daily builds) are for enthusiasts, and latest is for testers
Warning: This will pin you to a specific version, do not forget to rebase back to a channel to resume receiving updates.
Choose:                
  40-20241027     
  40-20241026     
  40-20241025     
  40-20241024     
  40-20241023     
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  40-20240930     
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  40-20240927  

[castrojo]

Thanks, anything past this can just be a manual rebase.