Append newline to EOF for .txt test data files

Reverts and fixes 102f0d3

compiler/testData/loadJava/compiledKotlin/classObject/ClassObjectExplicitVisibility.txt

@@ -70,4 +70,4 @@ public final class PubPub {
     public class object <class-object-for-PubPub> {
         /*primary*/ private constructor <class-object-for-PubPub>()
     }
-}
+}