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KaiOS: be more cautious about determining whether KaiAds is present

Just checking for the getKaiAd() function by doing "if (!getKaiAd ..."
throws a ReferenceError if it's not defined, and now my error box
catches that.  Using "if (getKaiAd === undefined ..." seems to be
acceptable, though.

--- a/kaios/kaiads-glue.js

+++ b/kaios/kaiads-glue.js

@@ -11,7 +11,7 @@

 (function() {

     // To run, we need to be on KaiOS with the KaiAds SDK and the

     // Open Web Apps API.

-    if (!getKaiAd || !navigator.mozApps ||

+    if (getKaiAd === undefined || navigator.mozApps === undefined ||

         navigator.userAgent.toLowerCase().indexOf('kaios') == -1) return;

     // If those prerequisites are satisfied, install the button.

     var advertbutton = document.createElement("button");