Apply suggestion from @Copilot

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: Lynx6319

minecraft-neoforge-modpack/minecraft-neoforge.json

@@ -110,7 +110,7 @@
             "text": "-Xms${memory}M -Xmx${mmax}M"
         }
     ],
-    "uninstall": null,
+    "uninstall": [],
     "run": {
         "command": "/bin/sh run.sh",
         "stop": "stop",