add trailing newlines to test files

otherwise I have to rollback dozens of files after using sed that follows conventions

compiler/testData/diagnostics/tests/declarationChecks/kt1141.jet

@@ -19,4 +19,4 @@ class <!ABSTRACT_MEMBER_NOT_IMPLEMENTED!>C<!> : SomeTrait {}
 
 fun foo2() {
     val <!UNUSED_VARIABLE!>r<!> = <!ABSTRACT_MEMBER_NOT_IMPLEMENTED!>object<!> : Runnable {} //no error
-}
+}

compiler/testData/diagnostics/tests/declarationChecks/kt559.jet

@@ -27,4 +27,4 @@ class <!ABSTRACT_MEMBER_NOT_IMPLEMENTED!>B<!>() : A() {
         super.fff() //everything is ok
         return super.<!ABSTRACT_SUPER_CALL!>foo()<!>  //no error!!
     }
-}
+}