Fixes issue where only wants of type block are stored in peerContext

codex/blockexchange/engine/engine.nim

@@ -401,7 +401,8 @@ proc wantListHandler*(
       address   = e.address
       wantType  = $e.wantType
 
-    if idx < 0: # updating entry
+    if idx < 0: # new entry
+      peerCtx.peerWants.add(e)
       let
         have = await e.address in b.localStore
         price = @(
@@ -424,9 +425,8 @@ proc wantListHandler*(
           `type`: BlockPresenceType.Have,
           price: price))
       elif e.wantType == WantType.WantBlock:
-        peerCtx.peerWants.add(e)
         codex_block_exchange_want_block_lists_received.inc()
-    else:
+    else: # update existing entry
       # peer doesn't want this block anymore
       if e.cancel:
         peerCtx.peerWants.del(idx)