Append newline to EOF for .txt test data files

Reverts and fixes 102f0d3

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

@@ -2,4 +2,4 @@ package test
 
 internal final class Clock</*0*/ A : java.lang.Number> where A : java.io.Serializable {
     /*primary*/ public constructor Clock</*0*/ A : java.lang.Number>() where A : java.io.Serializable
-}
+}