Adding transport to older chatmail account with `show_emails = '1'` does not work

[WofWca]

Counterpart of deltachat/deltachat-desktop#5927

I tested this like so:

1. Create a new account on Desktop.
2. Open dev tools.
3. await exp.rpc.setConfig(window.__selectedAccountId, 'show_emails', '1')
4. Export backup.
5. Import backup on Android.
6. Try to add another relay on Android

I am assuming that this probably means that more "normal" users are also affected, though I am not 100% sure. See my comment deltachat/deltachat-desktop#5927 (comment).

[adbenitez]

this should be fixed in core, not adding a hack to every client, the option is even bound to go away completely, see chatmail/core#7631 and the PR chatmail/core#7632 so when that is merged besides creating issues and patches all over the place now we need to repeat the same and remove the patches everywhere

[adbenitez]

actually with chatmail/core#7649 this shouldn't be a problem, it seems you are "hacking" the db in a way that is not normally possible by the users at the current core version you are in, normally the migration would run and then the setting been reset, but you are re-changing the setting via code in a recent core that is not supposed to change that option and hence the migration doesn't run

so this can be closed, probably the manual migrations added in Desktop and iOS can be removed but it is ok to wait for core to remove the setting