also quits

Boy, and I thought having to make the first commit was embarrassing, wait till people see that I realized that was missing and didn't think about the counterpart. At least I did think about it though, I wasn't even testing on 1.20 where it would break things.

plugin/src/main/java/com/lishid/openinv/util/InventoryManager.java

@@ -120,7 +120,10 @@ private void onPlayerJoin(@NotNull PlayerJoinEvent event) {
   @Keep
   @EventHandler(priority = EventPriority.MONITOR)
   private void onPlayerQuit(@NotNull PlayerQuitEvent event) {
-    consumeLoaded(event.getPlayer().getUniqueId(), inventory -> checkViewerAccess(inventory, false));
+    consumeLoaded(event.getPlayer().getUniqueId(), inventory -> {
+      inventory.setPlayerOffline();
+      checkViewerAccess(inventory, false);
+    });
   }
 
   @Keep