Fix json escaped raw networkmap. https://github.com/Koenkk/zigbee2mqtt/issues/3281

lib/extension/networkMap.js

@@ -78,7 +78,7 @@ class NetworkMap extends Extension {
     }
 
     raw(topology) {
-        return stringify(topology);
+        return topology;
     }
 
     graphviz(topology) {

test/networkMap.test.js

@@ -295,7 +295,6 @@ describe('Networkmap', () => {
         };
 
         const actual = JSON.parse(call[1]);
-        actual.data.value = JSON.parse(actual.data.value);
         expect(actual).toStrictEqual(expected);
     });