Fix the "Show Columns" menu to show correct state on startup.
The "Show Columns" menu would previously have a checkbox entered for every possible column for the playlist shown by default at JuK startup, even though most columns were not visible. This turned out to be because the class that reads the column configuration (Playlist::SharedSettings) was not being used to generate the Show Columns menu options. Instead the Playlist's own (defaulted) values were used. At this point in execution we can't force SharedSettings->apply() to run because the Playlist is not fully setup. Instead we expose the config values and use those to generate the menu.
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