hotfix: can login again

adds fallback pubkey as account and selects it when there are
no accounts

closes: https://github.com/damus-io/notedeck/issues/855

Signed-off-by: kernelkind <kernelkind@gmail.com>

crates/notedeck_columns/src/app.rs

@@ -433,6 +433,8 @@ impl Damus {
 
         let jobs = JobsCache::default();
 
+        ctx.accounts.with_fallback(FALLBACK_PUBKEY());
+
         Self {
             subscriptions: Subscriptions::default(),
             since_optimize: parsed_args.since_optimize,