fix: remove excess sleeping

only sleep after discarding

stock-manager.lua

@@ -24,6 +24,7 @@ function remove_waste(source, discard_rest)
                 _requestCount = amt,
             }
         )
+        os.sleep(1)
     end
     for slot, item in pairs(peripheral.call(source, "stock")) do
         if amounts_to_keep[item.name] ~= nil then
@@ -34,7 +35,6 @@ function remove_waste(source, discard_rest)
         elseif DISCARD_REST then
             discard(item, amt, DISCARD_ADDR)
         end
-        os.sleep(1)
     end
 end