timeline: auto-add yourself to your home timeline

This is the most intuitive, and damus iOS does the same thing. You
have to follow yourself, sorry. Otherwise you won't see your posts
when you post which is confusing.

Fixes: https://github.com/damus-io/notedeck/issues/509

crates/notedeck_columns/src/timeline/kind.rs

@@ -25,6 +25,13 @@ impl PubkeySource {
             PubkeySource::DeckAuthor => deck_author,
         }
     }
+
+    pub fn to_pubkey_bytes<'a>(&'a self, deck_author: &'a [u8; 32]) -> &'a [u8; 32] {
+        match self {
+            PubkeySource::Explicit(pk) => pk.bytes(),
+            PubkeySource::DeckAuthor => deck_author,
+        }
+    }
 }
 
 impl ListKind {
@@ -177,7 +184,7 @@ impl TimelineKind {
                     ));
                 }
 
-                match Timeline::contact_list(&results[0].note, pk_src.clone()) {
+                match Timeline::contact_list(&results[0].note, pk_src.clone(), default_user) {
                     Err(Error::App(notedeck::Error::Filter(FilterError::EmptyContactList))) => {
                         Some(Timeline::new(
                             TimelineKind::contact_list(pk_src),