fix: sandbox node mode api prefix (AztecProtocol#3662)

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# Checklist:
Remove the checklist to signal you've completed it. Enable auto-merge if
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- [ ] If the pull request requires a cryptography review (e.g.
cryptographic algorithm implementations) I have added the 'crypto' tag.
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unexpected formatting changes, testing logs, or commented-out code.
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Co-authored-by: PhilWindle <[email protected]>

yarn-project/aztec-sandbox/src/bin/index.ts

@@ -160,7 +160,7 @@ async function main() {
 
     const port = process.env.AZTEC_NODE_PORT || 8080; // Use standard 8080 when no PXE is running
     const nodeRpcServer = createAztecNodeRpcServer(node);
-    const app = nodeRpcServer.getApp();
+    const app = nodeRpcServer.getApp(API_PREFIX);
 
     // Add a /status endpoint
     const statusRouter = createStatusRouter(API_PREFIX);