Remove SSIM calculation on SEF videos.

SEF is similar to frame editing, where the input and output videos are
not intended to match, so SSIM will not provide a reliable value. To
check SSIM correctly in future, we would need to provide
golden/expected video files to compare output against.

PiperOrigin-RevId: 436707240

libraries/transformer/src/androidTest/java/androidx/media3/transformer/mh/TransformationTest.java

@@ -162,7 +162,6 @@ public class TransformationTest {
                 new TransformationRequest.Builder().setFlattenForSlowMotion(true).build())
             .build();
     new TransformerAndroidTestRunner.Builder(context, transformer)
-        .setCalculateSsim(true)
         .build()
         .run(testId, MP4_ASSET_SEF_URI_STRING);
   }