Fix JS global object corruption when invoking JS global hotkey handlers
As reported by Ragnarok and The Lizard Master, invoking a JS global hot-key handler (e.g. hitting Ctrl-U or Ctrl-P with the privatemsg or nodelist modules installed as handlers) would lead to the global object being cleared/corrupted so other scripts would then fail to run correctly (e.g. Error: can't open sbbsdefs.js: No such file or directory) This probably explains the JS_GC/JS_ENDREQUEST change needed when the hotkey-specific JS runtime/context/scope was introduced last year. Should revisit that too.
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