Append newline to EOF for .txt test data files

Reverts and fixes 102f0d3

compiler/testData/loadJava/compiledKotlin/class/ClassParamReferencesSelf.txt

@@ -5,4 +5,4 @@ internal final class ClassParamReferencesSelf</*0*/ A : test.TraitWithP<A>> {
 }
 
 internal trait TraitWithP</*0*/ P> {
-}
+}