Fix visuals of SWListInv with no dynamic size

SpigotCore_Main/src/de/steamwar/inventory/SWListInv.java

@@ -80,6 +80,11 @@ public class SWListInv<T> extends SWInventory {
                 setItem(53, SWItem.getDye(8), (byte) 8, Core.MESSAGE.parse("SWLISINV_NEXT_PAGE_INACTIVE", player), (ClickType click) -> {
                 });
             }
+        } else if (!dynamicSize) {
+            setItem(45, SWItem.getDye(8), (byte) 8, Core.MESSAGE.parse("SWLISINV_PREVIOUS_PAGE_INACTIVE", player), (ClickType click) -> {
+            });
+            setItem(53, SWItem.getDye(8), (byte) 8, Core.MESSAGE.parse("SWLISINV_NEXT_PAGE_INACTIVE", player), (ClickType click) -> {
+            });
         }
 
         int ipageLimit = elements.size() - page * 45;