Fix 1 ErrorProneStyle finding:

* The Google Java Style Guide requires that each switch statement includes a default statement group, even if it contains no code. (This requirement is lifted for any switch statement that covers all values of an enum.)
  (see http://go/bugpattern/MissingDefault)

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#codehealth

PiperOrigin-RevId: 368586454

demos/gl/src/main/java/com/google/android/exoplayer2/gldemo/BitmapOverlayVideoProcessor.java

@@ -140,6 +140,7 @@ import javax.microedition.khronos.opengles.GL10;
         case "scaleY":
           uniform.setFloat(bitmapScaleY);
           break;
+        default: // fall out
       }
     }
     for (GlUtil.Attribute copyExternalAttribute : attributes) {