Fix syntax error in plugins/subspace_storage/static/storage.js (#302)

Fix _lastData being used as a global causing the script to fail to load
after strict mode was added.

plugins/subspace_storage/static/storage.js

@@ -1,6 +1,6 @@
 // function to draw data we recieve from ajax requests
 "use strict";
-_lastData = [];
+var _lastData = [];
 function drawcontents(data) {
 	data = data || _lastData; //Cache data so we can drawcontents without waiting for the server, for the search box.
 	_lastData = data;