Append newline to EOF for .txt test data files

Reverts and fixes 102f0d3

compiler/testData/loadJava/compiledKotlin/fromLoadJava/notNull/NotNullParameter.txt

@@ -3,4 +3,4 @@ package test
 public open class NotNullParameter {
     /*primary*/ public constructor NotNullParameter()
     public open fun hi(/*0*/ p0: kotlin.String): kotlin.Unit
-}
+}