[BUG] Can't react to issue body

[JayanAXHF]

We can't react to issue bodies because the selected_comment_id returns a None for the issue body.

Related function:

fn selected_comment_id(&self) -> Option<u64> {
    let selected = self.list_state.selected_checked()?;
    match self.message_keys.get(selected)? {
        MessageKey::Comment(id) => Some(*id),
        MessageKey::IssueBody(_) => None
    }
}