Fix calendar page without account

[Weiko]

More details in this PR #7202

We(I) forgot to fix on the calendar page.

[greptile-apps]

PR Summary

This change optimizes the calendar page functionality when no accounts are connected, preventing unnecessary API calls.

• Added 'skip' parameter to useFindManyRecords hook in packages/twenty-front/src/modules/settings/accounts/components/SettingsAccountsCalendarChannelsContainer.tsx
• Set skip condition to !accounts.length, avoiding query execution when no accounts are present
• Improves performance by reducing unnecessary network requests when there's no data to fetch

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