Fixed typo for Plex Media Server version 1.22.1.4228. (#13345)

* Fixed typo for Plex Media Server version 1.22.1.4228.

* Update Plex.PlexMediaServer.yaml

* Rename Plex.PlexMediaServer.yaml to plex.plexmediaserver.yaml

manifests/p/plex/plexmediaserver/1.22.1.4228/plex.plexmediaserver.yaml

@@ -1,4 +1,4 @@
-PackageIdentifier: Plex.PlexMediaServer
+PackageIdentifier: plex.plexmediaserver
 Publisher: Plex
 PackageName: Plex Media Server
 Author: Plex
@@ -10,7 +10,7 @@ Tags:
 - video
 - music
 PackageUrl: https://www.plex.tv/media-server-downloads/
-License: Copyright © 2020, Plex
+License: Copyright © 2020, Plex
 LicenseUrl: https://www.plex.tv/about/privacy-legal/plex-terms-of-service/
 MinimumOSVersion: 10.0.0.0
 PackageVersion: 1.22.1.4228