[K/JS] Exclude default from the regular reserved keywords to give ability to export declarations with default export ^KT-54480 Fixed

fix(KT-54480): exclude default from the regular reserved keywords to give ability to export intities with default export.

Merge-request: KT-MR-7459
Merged-by: Artem Kobzar <Artem.Kobzar@jetbrains.com>

compiler/testData/diagnostics/testsWithJsStdLib/export/nonConsumableIdentifiers.kt

@@ -24,6 +24,10 @@ val bar = 4
 @JsName(<!NON_CONSUMABLE_EXPORTED_IDENTIFIER!>"super"<!>)
 class Baz
 
+@JsExport
+@JsName("default")
+class DefDef
+
 @JsExport
 class Test {
     fun instanceof() {}