Fix API early Stat Point allocation (#10680)

* Refactor hasClass check to common so it can be used in shared & server-side code

* Check that user has selected class before allocating stat points

website/common/script/libs/hasClass.js

@@ -0,0 +1,8 @@
+// Check if user has Class system enabled
+module.exports = function hasClass (member) {
+  return (
+    member.stats.lvl >= 10 &&
+    !member.preferences.disableClasses &&
+    member.flags.classSelected
+  );
+};