Addresses #481
Inverts the item list return, to make sure we always trigger wg.Done and not hang the widget
Clean up config for toplist widget, as we were assigning to `currencies` rather than `top` erroneously
Rather than referencing wtc.Config, instead pass the global config
Also, look up config for the module early and pass that in sooner, to deal with fewer long paths and get rid of the
ConfigKey variable
