Update MCP discovery enabled setting key

Changed the 'chat.mcp.discovery.enabled' key from 'claude-desktop' to 'cursor-global' in settings.json to reflect updated configuration requirements.

settings.json

@@ -49,7 +49,7 @@
   "chat.editing.confirmEditRequestRemoval": false,
   "chat.mcp.autostart": "newAndOutdated",
   "chat.mcp.discovery.enabled": {
-    "claude-desktop": true
+    "cursor-global": true
   },
   "chat.mcp.gallery.enabled": true,
   "chat.tools.global.autoApprove": true,