Replace @native with external in tests

compiler/testData/diagnostics/testsWithJsStdLib/native/inheritance.kt

@@ -1,5 +1,3 @@
-// !DIAGNOSTICS: -DEPRECATION
-
 open class A
 
 interface I
@@ -10,8 +8,6 @@ external class <!EXTERNAL_TYPE_EXTENDS_NON_EXTERNAL_TYPE!>C<!> : A
 
 external class <!EXTERNAL_TYPE_EXTENDS_NON_EXTERNAL_TYPE!>D<!> : B, I
 
-@native class <!EXTERNAL_TYPE_EXTENDS_NON_EXTERNAL_TYPE!>N<!> : A()
-
 external interface <!EXTERNAL_TYPE_EXTENDS_NON_EXTERNAL_TYPE!>K<!> : I
 
 external enum class E {