fix: Remove undefined params in MultichainRouter

Author: FrederikBolding

packages/snaps-controllers/coverage.json

@@ -1,5 +1,5 @@
 {
-  "branches": 93.61,
+  "branches": 93.63,
   "functions": 98.16,
   "lines": 98.5,
   "statements": 98.33

packages/snaps-controllers/src/multichain/MultichainRouter.ts

@@ -301,7 +301,7 @@ export class MultichainRouter {
       jsonrpc: '2.0' as const,
       id: rawRequest.id ?? nanoid(),
       method: rawRequest.method,
-      params: rawRequest.params,
+      ...(rawRequest.params ? { params: rawRequest.params } : {}),
     };
 
     const { method, params } = request;