js-on-sx: js-new-call accepts list-typed constructor returns

new Array(1,2,3) was returning an empty wrapper object because
js-new-call only honoured a non-undefined return when
(type-of ret) === "dict"; SX lists (representing JS arrays) were
silently discarded. Widened the check to accept "list" too.
Fixes new Array(1,2,3).length, String(new Array(1,2,3)), and any
constructor whose body returns a list. built-ins/String:
67/99 → 69/99 (canonical). conformance.sh: 148/148.

lib/js/test262-scoreboard.json

@@ -1,26 +1,26 @@
 {
   "totals": {
-    "pass": 67,
-    "fail": 26,
+    "pass": 69,
+    "fail": 24,
     "skip": 1,
     "timeout": 6,
     "total": 100,
     "runnable": 99,
-    "pass_rate": 67.7
+    "pass_rate": 69.7
   },
   "categories": [
     {
       "category": "built-ins/String",
       "total": 100,
-      "pass": 67,
-      "fail": 26,
+      "pass": 69,
+      "fail": 24,
       "skip": 1,
       "timeout": 6,
-      "pass_rate": 67.7,
+      "pass_rate": 69.7,
       "top_failures": [
         [
           "Test262Error (assertion failed)",
-          14
+          12
         ],
         [
           "TypeError: not a function",
@@ -44,7 +44,7 @@
   "top_failure_modes": [
     [
       "Test262Error (assertion failed)",
-      14
+      12
     ],
     [
       "TypeError: not a function",
@@ -68,6 +68,6 @@
     ]
   ],
   "pinned_commit": "d5e73fc8d2c663554fb72e2380a8c2bc1a318a33",
-  "elapsed_seconds": 364.7,
+  "elapsed_seconds": 344.4,
   "workers": 1
 }