Append newline to EOF for .txt test data files

Reverts and fixes 102f0d3

compiler/testData/loadJava/compiledKotlin/dataClass/NoComponents.txt

@@ -8,4 +8,4 @@ kotlin.data() internal final class DataClass {
 kotlin.data() internal final class OtherDataClass {
     /*primary*/ public constructor OtherDataClass()
     internal final /*synthesized*/ fun copy(): test.OtherDataClass
-}
+}