fix: prepare for the bridge module also using podium global

Author: wkillerud

src/MessageBus.js

@@ -20,11 +20,14 @@ function getGlobalObjects() {
     let objs = getGlobalThis()['@podium'];
     if (!objs) {
         objs = {};
+        getGlobalThis()['@podium'] = objs;
+    }
+    if (!objs.ee) {
         objs.ee = new EventEmitter();
+    }
+    if (!objs.sink) {
         objs.sink = new Sink();
-        getGlobalThis()['@podium'] = objs;
     }
-
     return objs;
 }