LibraryConfigGUI now starts reasonably sized.

src/main/java/musicplayer/LibraryConfigGUI.java

@@ -16,7 +16,7 @@ public class LibraryConfigGUI {
         JFrame frame = new JFrame();
         frame.setContentPane(createUI());
         frame.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
-        frame.pack();
+        frame.setSize(300, 200);
         frame.setVisible(true);
         updateLibraryListContents();
     }