fix: add missing closing brace in emergencystop case block

The emergencystop case was missing its closing } before the
simulateMeasurement case, causing a SyntaxError on load.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/nodeClass.js

@@ -324,6 +324,7 @@ class nodeClass {
               const { source: esSource, action: esAction } = msg.payload;
               m.handleInput(esSource, esAction);
               break;
+            }
             case 'simulateMeasurement':
               {
                 const payload = msg.payload || {};