Fixed GUI bug

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/gui/menu/RenderedInventory.kt

@@ -60,6 +60,19 @@ class RenderedInventory(
         }
 
         menu.runOnRender(player)
+
+        for (row in (1..menu.rows)) {
+            for (column in (1..menu.columns)) {
+                val bukkit = MenuUtils.rowColumnToSlot(row, column, menu.columns)
+
+                val slot = menu.getSlot(row, column, player, menu)
+                val renderedItem = slot.getItemStack(player)
+
+                if (!slot.isCaptive(player, menu)) {
+                    inventory.setItem(bukkit, renderedItem)
+                }
+            }
+        }
     }
 
     fun renderDefaultCaptiveItems() {