Propagate error policy to ProgressiveMediaSource used for subtitles

This only affects playbacks using the
experimentalUseProgressiveMediaSourceForSubtitles method.

Also update the SingleSampleMediaSource instantiation to be more
similar, to try and highlight differences like this in future.

PiperOrigin-RevId: 424545980

library/core/src/main/java/com/google/android/exoplayer2/source/DefaultMediaSourceFactory.java

@@ -365,15 +365,14 @@ public final class DefaultMediaSourceFactory implements MediaSourceFactory {
                   };
           mediaSources[i + 1] =
               new ProgressiveMediaSource.Factory(dataSourceFactory, extractorsFactory)
+                  .setLoadErrorHandlingPolicy(loadErrorHandlingPolicy)
                   .createMediaSource(
                       MediaItem.fromUri(subtitleConfigurations.get(i).uri.toString()));
         } else {
-          SingleSampleMediaSource.Factory singleSampleSourceFactory =
-              new SingleSampleMediaSource.Factory(dataSourceFactory)
-                  .setLoadErrorHandlingPolicy(loadErrorHandlingPolicy);
           mediaSources[i + 1] =
-              singleSampleSourceFactory.createMediaSource(
-                  subtitleConfigurations.get(i), /* durationUs= */ C.TIME_UNSET);
+              new SingleSampleMediaSource.Factory(dataSourceFactory)
+                  .setLoadErrorHandlingPolicy(loadErrorHandlingPolicy)
+                  .createMediaSource(subtitleConfigurations.get(i), /* durationUs= */ C.TIME_UNSET);
         }
       }