AllAccounts: AllFolders.listMessages(): must be a Collection

[jermy-c]

Reproduction

1. Select All accounts
2. Select a folder in all accounts
3. Might need to click through the folders

Actual Result

1. Yellow banner error: must be a Collection

Expected Result

1. No error

Stack

error.ts:6 Error: must be a Collection
    at assert (svelte-collections.js?v=790a80fa:82:11)
    at AdditionCollection.addColl (svelte-collections.js?v=790a80fa:1153:5)
    at mergeColl (svelte-collections.js?v=790a80fa:1125:11)
    at AllFolders.listMessages (AllFolders.ts:36:12)
    at async loadFolder (MailApp.svelte:40:28)

[benbucksch]

I've disabled this feature for now, due to too many bugs. Before testing this, revert the one-liner git commit e30bde2 to re-enable the feature.

[benbucksch]

https://mustang-jq.sentry.io/issues/14798142/