fix(offline): Fix store persistent licenses with drm info in the pssh (…

…#6143)

Fixes #6141

lib/offline/storage.js

@@ -400,6 +400,10 @@ shaka.offline.Storage = class {
           downloader, config, activeHandle.cell, manifest, drmEngine);
       this.ensureNotDestroyed_();
 
+      this.setManifestDrmFields_(manifest, manifestDB, drmEngine, config);
+      await activeHandle.cell.updateManifest(manifestId, manifestDB);
+      this.ensureNotDestroyed_();
+
       const offlineUri = shaka.offline.OfflineUri.manifest(
           activeHandle.path.mechanism, activeHandle.path.cell, manifestId);