Fix pagination only removing a single layer

src/main/kotlin/pw.hamzantal.shopreborn/Util.kt

@@ -7,6 +7,7 @@ import org.bukkit.configuration.ConfigurationSection
 import org.bukkit.entity.Player
 import org.bukkit.inventory.Inventory
 import org.bukkit.inventory.ItemStack
+import kotlin.math.max
 
 val String.c: String
     get() = ChatColor.translateAlternateColorCodes('&', this)
@@ -48,7 +49,7 @@ fun makeInventory(
             if (page != total) setItem(menuRow + 8, buttons.forward)
         }
 
-        val dropping = (page - 1) * (size - kotlin.math.max(0, menuRow))
+        val dropping = (page - 1) * (if(menuRow > 0) (size - 9) else size)
         items.drop(dropping).forEach {
             if (firstEmpty() != -1) setItem(firstEmpty(), it.item)
             else return@apply