need mutable ndb reference to unsubscribe

Closes: https://github.com/damus-io/notedeck/pull/584

crates/notedeck/src/context.rs

@@ -6,7 +6,7 @@ use nostrdb::Ndb;
 // TODO: make this interface more sandboxed
 
 pub struct AppContext<'a> {
-    pub ndb: &'a Ndb,
+    pub ndb: &'a mut Ndb,
     pub img_cache: &'a mut ImageCache,
     pub unknown_ids: &'a mut UnknownIds,
     pub pool: &'a mut RelayPool,

crates/notedeck_chrome/src/app.rs

@@ -162,7 +162,7 @@ impl Notedeck {
 
     pub fn app_context(&mut self) -> AppContext<'_> {
         AppContext {
-            ndb: &self.ndb,
+            ndb: &mut self.ndb,
             img_cache: &mut self.img_cache,
             unknown_ids: &mut self.unknown_ids,
             pool: &mut self.pool,

crates/notedeck_columns/src/multi_subscriber.rs

@@ -37,7 +37,7 @@ impl MultiSubscriber {
         })
     }
 
-    pub fn unsubscribe(&mut self, ndb: &Ndb, pool: &mut RelayPool) {
+    pub fn unsubscribe(&mut self, ndb: &mut Ndb, pool: &mut RelayPool) {
         if self.subscribers == 0 {
             error!("No subscribers to unsubscribe from");
             return;

crates/notedeck_columns/src/nav.rs

@@ -407,7 +407,7 @@ pub fn render_nav(
     RenderNavResponse::new(col, nav_response)
 }
 
-fn unsubscribe_timeline(ndb: &Ndb, timeline: &Timeline) {
+fn unsubscribe_timeline(ndb: &mut Ndb, timeline: &Timeline) {
     if let Some(sub_id) = timeline.subscription {
         if let Err(e) = ndb.unsubscribe(sub_id) {
             error!("unsubscribe error: {}", e);

crates/notedeck_columns/src/notes_holder.rs

@@ -155,7 +155,7 @@ pub trait NotesHolder {
     /// Local NotesHolder unsubscribe
     fn unsubscribe_locally<M: NotesHolder>(
         txn: &Transaction,
-        ndb: &Ndb,
+        ndb: &mut Ndb,
         note_cache: &mut NoteCache,
         notes_holder_storage: &mut NotesHolderStorage<M>,
         pool: &mut RelayPool,