Remove space in exception message.

This space was added by mistake in a prior CL of mine.

PiperOrigin-RevId: 510157363

library/transformer/src/main/java/com/google/android/exoplayer2/transformer/ExportException.java

@@ -262,7 +262,7 @@ public final class ExportException extends Exception {
    */
   public static ExportException createForAudioProcessing(Throwable cause, AudioFormat audioFormat) {
     return new ExportException(
-        "Audio processing error, audio_format = " + audioFormat,
+        "Audio processing error, audio_format=" + audioFormat,
         cause,
         ERROR_CODE_AUDIO_PROCESSING_FAILED);
   }

library/transformer/src/main/java/com/google/android/exoplayer2/transformer/TransformationException.java

@@ -266,7 +266,7 @@ public final class TransformationException extends Exception {
   public static TransformationException createForAudioProcessing(
       Throwable cause, AudioFormat audioFormat) {
     return new TransformationException(
-        "Audio processing error, audio_format = " + audioFormat,
+        "Audio processing error, audio_format=" + audioFormat,
         cause,
         ERROR_CODE_AUDIO_PROCESSING_FAILED);
   }