Harden _Q.push wrapper in the amzn_apstag.js shim

Apstag calls are queued onto the `window.apstag._Q` array and are then
called when the Apstag script is ready. Each queued call is usually an
array containing the API method name prefix and arguments, e.g.

    ["f", {slots: [...], timeout: 3000}, () => { ... }]

Some websites however seem to queue up the calls differently, with a
queued call looking something like this instead:

    [["f", Arguments([{slots: [...], timeout: 3000}, () => { ... }])]]

Since the original script handles that, the shim needs to as
well. Let's try our best here.

surrogates/amzn_apstag.js

@@ -58,6 +58,14 @@ if (!(window.apstag && window.apstag._getSlotIdToNameMapping)) {
   window.apstagLOADED = true;
 
   _Q.push = function(prefix, args) {
+    if (Array.isArray(prefix) && typeof args === "undefined") {
+      [prefix, ...args] = prefix;
+    }
+    if (args.length === 1 &&
+        (args[0].toString() === "[object Arguments]" || Array.isArray(args[0]))) {
+      args = Array.from(args[0]);
+    }
+
     try {
       switch (prefix) {
         case "f":