Don't write Kotlin metadata in light classes mode

This was already happening for classes and packages, now will also for
interface DefaultImpls and any other possible classes

compiler/testData/asJava/lightClasses/nullabilityAnnotations/TraitClassObjectField.java

@@ -16,7 +16,6 @@ public interface TraitClassObjectField {
         private Companion() { /* compiled code */ }
     }
 
-    @kotlin.jvm.internal.KotlinSyntheticClass(version = {0, 27, 0}, abiVersion = 27)
     static final class DefaultImpls {
     }
 }