Add indent for synthetic class printing

Change-Id: Ic7191125c2dfdcd92e4adff4b49664baef4ea762
diff --git a/src/main/java/com/android/tools/r8/kotlin/KotlinMetadataWriter.java b/src/main/java/com/android/tools/r8/kotlin/KotlinMetadataWriter.java
index 1a51644..ca1d394 100644
--- a/src/main/java/com/android/tools/r8/kotlin/KotlinMetadataWriter.java
+++ b/src/main/java/com/android/tools/r8/kotlin/KotlinMetadataWriter.java
@@ -131,7 +131,7 @@
 
   private static String kotlinSyntheticClassToString(
       KotlinClassMetadata.SyntheticClass kMetadata, String indent) {
-    StringBuilder sb = new StringBuilder();
+    StringBuilder sb = new StringBuilder(indent);
     KotlinMetadataWriter.appendKmSection(
         indent,
         "Metadata.SyntheticClass",