Fix remote player SDK types and signing prefix; test remote commands

MusicBridgeRemote/Info.plist

@@ -26,7 +26,7 @@
 		<string>com.apple.nowplaying.remote-media</string>
 	</dict>
 	<key>MusicBridgeSharedKeychainGroup</key>
-	<string>$(AppIdentifierPrefix)ru.yukinoki.musicbridge.remote-control</string>
+	<string>ru.yukinoki.musicbridge.remote-control</string>
 	<key>NSLocalNetworkUsageDescription</key>
 	<string>MusicBridge подключается к вашему ПК, чтобы показывать музыку и управлять воспроизведением.</string>
 	<key>NSAppTransportSecurity</key>

MusicBridgeRemote/MusicBridgeRemote.swift

@@ -40,7 +40,7 @@ final class PCMediaSession: RemoteMediaSessionRepresentable {
     }
 
     var playbackSnapshot: MediaPlaybackSnapshot? {
-        MediaPlaybackSnapshot(state: attributes.playing ? .playing(rate: attributes.rate) : .paused,
+        MediaPlaybackSnapshot(state: attributes.playing ? .playing(rate: Float(attributes.rate)) : .paused,
                               elapsedTime: attributes.position, timestamp: attributes.timestamp)
     }