cat.mvmike.minimalcalendarwidget: Remove Description since it's provided by fastlane
The maintainer has moved description, etc. to fastlane. This MR removes the "old" description, so it fastlane can be used.
See https://github.com/mvmike/min-cal-widget/issues/59#issuecomment-778669571
The maintainer hasn't re-tagged the release, yet.