Update mcp-polkadot.md (#2655)

Author: keeganquigley

applications/mcp-polkadot.md

@@ -8,6 +8,7 @@
 - **Team Name:**
 - **Payment Details:**
 - **[Level](https://grants.web3.foundation/docs/Introduction/levels):** 2
+- **Status:** Terminated
 
 > [!IMPORTANT]
 > *The combination of your GitHub account submitting the application and the payment address above will be your unique identifier during the program. Please keep them safe.*