Append newline to EOF for .txt test data files

Reverts and fixes 102f0d3

compiler/testData/loadJava/compiledJava/vararg/VarargInt.txt

@@ -3,4 +3,4 @@ package test
 public open class VarargInt {
     public constructor VarargInt()
     public open fun vararg(/*0*/ vararg p0: kotlin.Int /*kotlin.IntArray!*/): kotlin.Unit
-}
+}

compiler/testData/loadJava/compiledJava/vararg/VarargString.txt

@@ -3,4 +3,4 @@ package test
 public open class VarargString {
     public constructor VarargString()
     public open fun vararg(/*0*/ vararg p0: kotlin.String! /*kotlin.Array<(out) kotlin.String!>!*/): kotlin.Unit
-}
+}