Check what happens when a note in a shared folder is deleted

[laurent22]

Ref: #11458 (comment)

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Ok I think that makes sense to fix this particular crash then. Also to address his comment:

I own several shares that I made available to other JoplinCloud basic accounts when the ‘read only’ option was not yet available. Later, when I discovered that the ‘read only’ option was offered, I changed these shares to ‘read only’.

Could you please check what happens when a note in a shared folder is moved to the trash? Do we clear the share_id and is_shared property?

As for read-only items, I believe there are checks in place to prevent them from being deleted in general. I think it was only possible in this case maybe due to a bug with share_id not being cleared.