Remove Request Identifier from message

Summary:
{F684271717}
^
This is causing the error being reported quite a lot. The identifier doesn't provide much information to the person analysing the error. Only ever useful if debugging.

Reviewed By: antonk52, mweststrate

Differential Revision: D32828150

fbshipit-source-id: f29fbf6bfe389fec6ef888fc01be6c058193709d

desktop/flipper-server-core/src/comms/WebSocketClientConnection.tsx

@@ -41,7 +41,7 @@ export default class WebSocketClientConnection implements ClientConnection {
     const callbacks = this.pendingRequests.get(id);
 
     if (!callbacks) {
-      throw new Error(`Pending request ${id} is not found`);
+      throw new Error('Pending request was not found');
     }
 
     this.pendingRequests.delete(id);