[ObjCExport] Fix property setter

KT-64953: Required part for enum translation

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

@@ -0,0 +1,9 @@
+@file:OptIn(ExperimentalObjCName::class)
+
+import kotlin.experimental.ExperimentalObjCName
+
+@kotlin.native.ObjCName("objcValName", "swiftValName")
+val valProperty = 42
+
+@kotlin.native.ObjCName("objcVaRName", "swiftVaRName")
+var varProperty = 42