fix(VCalendar): missing events under certain circumstances

[jacekkarczmarczyk]

events in

vuetify/packages/vuetify/src/components/VCalendar/mixins/calendar-with-events.ts

Line 168 in d9668ce

const { parent, events, more } = eventsMap[date]

were not sorted by the position (bounding rect), so if the first event was outside of the calendar cell then hide was set to true and all next events were treated as hidden. This PR sorts event by the bottom position, not sure if there's a way to get events properly sorted in getEventsMap

fixes #13720

How Has This Been Tested?

playground

Markup:

https://gist.githubusercontent.com/jacekkarczmarczyk/cd30d957a7d2a629e2bdd738d2fc6d61/raw/eaaf8d89c770c66fc27015bbeb382a27e5ba5ef1/vuetify-13720-playground.vue

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Improvement/refactoring (non-breaking change that doesn't add any features but makes things better)

Checklist:

• The PR title is no longer than 64 characters.
• The PR is submitted to the correct branch (master for bug fixes and documentation updates, dev for new features and backwards compatible changes and next for non-backwards compatible changes).
• My code follows the code style of this project.
• I've added relevant changes to the documentation (applies to new features and breaking changes in core library)