Replace document.getElementById("customGctButton").onclick with docum…

…ent.getElementById("customGctButton")['onclick'] as suggested by Adam. This drops the migrated handlers from text searches looking for typical inline handler patterns ("onclick = ")

lincs/resources/views/CustomGCT.html

@@ -9,7 +9,7 @@
     }
     LABKEY.Utils.onReady(function()
     {
-        document.getElementById("customGctButton").onclick = function() { showCustomGCTForm(); };
+        document.getElementById("customGctButton")['onclick'] = showCustomGCTForm;
     });
 
 </script>