fix(calendarPicker): undefined calendar

[hamza221]

fix #6461

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 23.47%. Comparing base (8cb3aed) to head (94fc5d1). Report is 12 commits behind head on main.

Files with missing lines	Patch %	Lines
src/components/AppointmentConfigModal.vue	0.00%	2 Missing :warning:
src/components/Shared/CalendarPicker.vue	0.00%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #6468 +/- ## ============================================ - Coverage 23.47% 23.47% -0.01% Complexity 454 454 ============================================ Files 247 247 Lines 11708 11710 +2 Branches 2212 2223 +11 ============================================ Hits 2749 2749 - Misses 8639 8641 +2 Partials 320 320 ``` | [Flag](https://app.codecov.io/gh/nextcloud/calendar/pull/6468/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nextcloud) | Coverage Δ | | |---|---|---| | [javascript](https://app.codecov.io/gh/nextcloud/calendar/pull/6468/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nextcloud) | `15.05% <0.00%> (-0.01%)` | :arrow_down: | | [php](https://app.codecov.io/gh/nextcloud/calendar/pull/6468/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nextcloud) | `59.42% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nextcloud#carryforward-flags-in-the-pull-request-comment) to find out more.

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