[MIRROR] Make middle clicks work in the new alt panel (#11178)

Co-authored-by: ShadowLarkens <shadowlarkens@gmail.com>

tgui/packages/tgui/interfaces/LootPanel/LootBox.tsx

@@ -1,3 +1,4 @@
+import { type MouseEvent } from 'react';
 import { useBackend } from 'tgui/backend';
 import { Button, Stack } from 'tgui-core/components';
 import type { BooleanLike } from 'tgui-core/react';
@@ -38,14 +39,15 @@ export function LootBox(props: Props) {
       p={0}
       fluid
       color="transparent"
-      onClick={(event) =>
+      onMouseDown={(event: MouseEvent) => {
         act('grab', {
           alt: event.altKey,
           ctrl: event.ctrlKey,
           ref: item.ref,
           shift: event.shiftKey,
-        })
-      }
+          middle: event.button === 1,
+        });
+      }}
       onContextMenu={(event) => {
         event.preventDefault();
         act('grab', {