[JS IR] Not export fun with stable name and default argument

if it is not exported, but just with stable name

^KT-50464 fixed

Merge-request: KT-MR-5324
Merged-by: Ilya Goncharov <Ilya.Goncharov@jetbrains.com>

js/js.translator/testData/typescript-export/selectiveExport/selectiveExport.kt

@@ -30,6 +30,9 @@ class Class
 
 external interface ExternalInterface
 
+@JsName("bbb")
+fun zzz(x: Int = 10) {}
+
 // FILE: file2.kt
 
 @file:JsExport