Append newline to EOF for .txt test data files

Reverts and fixes 102f0d3

compiler/testData/loadJava/compiledKotlin/enum/enumWithConstuctor.txt

@@ -79,4 +79,4 @@ internal final enum class En : kotlin.Enum<test.En> {
     // Static members
     public final /*synthesized*/ fun valueOf(/*0*/ value: kotlin.String): test.En
     public final /*synthesized*/ fun values(): kotlin.Array<test.En>
-}
+}