flatpak --persist should be relative to home

Current manifest includes this override `--persist=~/.ssh`. This creates a path like `~/.var/app/com.logseq.Logseq/~/.ssh`

AFAIK it should be `--persist=.ssh` which would result in `~/.var/app/com.logseq.Logseq/.ssh`

The flatpak-override manpage is ambiguous about this, but flatpak-run manpage has an example that shows `--persist=.local/state`

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However I don't know what's the purpose of this in the first place, since [it apparently wasn't needed to fix the issue with ssh](https://github.com/flathub/com.logseq.Logseq/issues/35#issuecomment-1834614938) (the solution that was tested did not include `--persist`)