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js: When removing the status bar, null out its variable

It seems polite to allow it to be garbage-collected.

--- a/emcclib.js

+++ b/emcclib.js

@@ -536,6 +536,7 @@

     js_canvas_remove_statusbar: function() {

         if (statusbar !== null)

             statusbar.parentNode.removeChild(statusbar);

+        statusbar = null;

     },

     /*