proper init of objects on modern secure signals

Author: ssundahlTTD

src/secureSignal_shared.ts

@@ -28,11 +28,8 @@ export class UidSecureSignalProvider implements UidSecureSignalProviderType {
       return;
     }
 
-    window.googletag = window.googletag || {
-      cmd: [],
-    };
-
-    window.googletag.secureSignalProviders = window.googletag.secureSignalProviders || [];
+    window.googletag = window.googletag || {};
+    window.googletag.secureSignalProviders = window.googletag.secureSignalProviders || {};
 
     if (!this.hasRegisteredSecureSignals) {
       this.hasRegisteredSecureSignals = true;