Don't pass deviceVolume as volume in MediaControllerImplLegacy

deviceVolume (int) and volume (float) are not the same. Elsewhere
MediaControllerImplLegacy doesn't support volume and defaults to 1
(setVolume, getVolume), so defaulting to 1 here seems correct.

PiperOrigin-RevId: 406780391

libraries/session/src/main/java/androidx/media3/session/MediaControllerImplLegacy.java

@@ -2022,7 +2022,7 @@ import org.checkerframework.checker.nullness.compatqual.NullableType;
             /* videoSize= */ VideoSize.UNKNOWN,
             /* timeline= */ currentTimeline,
             /* playlistMetadata= */ playlistMetadata,
-            /* volume= */ deviceVolume,
+            /* volume= */ 1.0f,
             /* audioAttributes= */ audioAttributes,
             /* cues= */ Collections.emptyList(),
             /* deviceInfo= */ deviceInfo,