resending a message not working if chat was deleted before

resending a webxdc is not working sometimes.

i just had that in a 4 group that was deleted accidentally by one member, resending a message does not work in that case.

EDIT: it is because of the deletion of the message, some logic prevents re-download rightfully and is in conflict with accidental deletion:

to reproduce:

- Alice creates a group, adds Bob
- Alice sends eg. a mini app
- Bob leaves the group
- Alice re-adds Bob and resend the mini app
- Bob will not receive the resending

for new members, resending is fine, just tested.

not sure what we can do about that without weakening the - honestly more important - usecase of preventing multiple downloads, which becomes more important with multi-relay even.