Append newline to EOF for .txt test data files

Reverts and fixes 102f0d3

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

@@ -3,4 +3,4 @@ package test
 public open class NotNullIntArray {
     /*primary*/ public constructor NotNullIntArray()
     public open fun hi(): kotlin.IntArray
-}
+}