Only show update source when app is marked updateable (#4059)

frontend/src/app/scripts/_components/ScriptItems/Buttons.tsx

@@ -64,7 +64,7 @@ export default function Buttons({ item }: { item: Script }) {
       icon: <Code className="h-4 w-4" />,
       text: "Install Source",
     },
-    updateSourceUrl && {
+    updateSourceUrl && item.updateable && {
       href: updateSourceUrl,
       icon: <RefreshCcw className="h-4 w-4" />,
       text: "Update Source",