Fix invsee might cause items to disappear (#3065)

Author: tanyaofei

Essentials/src/main/java/com/earth2me/essentials/EssentialsPlayerListener.java

@@ -991,11 +991,19 @@ public void onInventoryDragEvent(final InventoryDragEvent event) {
         if (!user.isInvSee()) {
             return;
         }
-        if (event.getNewItems().keySet().stream().anyMatch(slot -> slot > 35)) {
-            event.setCancelled(true);
+
+        for (int slot : event.getNewItems().keySet()) {
+            if (this.isBottomInventorySlot(slot)) {
+                event.setCancelled(true);
+                break;
+            }
         }
     }
 
+    private boolean isBottomInventorySlot(int slot) {
+        return slot > 35;
+    }
+
     @EventHandler(priority = EventPriority.MONITOR)
     public void onInventoryCloseEvent(final InventoryCloseEvent event) {
         Player refreshPlayer = null;