[ObjCExport] Fix property setter

KT-64953: Required part for enum translation

native/objcexport-header-generator/testData/headers/specialFunctionNames/Foo.kt

@@ -0,0 +1,7 @@
+class Foo {
+    fun alloc() {}
+    fun copy(): Foo = Foo()
+    fun mutableCopy(): Foo = Foo()
+    fun new(): Foo = Foo()
+    fun init(): Foo = Foo()
+}