Fix: Initial selection state

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

Author: KSSJW

HMCL/src/main/java/org/jackhuang/hmcl/ui/directory/GameDirectoryListItemSkin.java

@@ -49,7 +49,7 @@ public GameDirectoryListItemSkin(GameDirectoryListItem skinnable) {
         root.setPickOnBounds(false);
         RipplerContainer container = new RipplerContainer(root);
 
-        SVGContainer left = SVG.FOLDER.createIcon(20);
+        SVGContainer left = (skinnable.selectedProperty().get() ? SVG.FOLDER_FILL : SVG.FOLDER).createIcon(20);
         left.setMouseTransparent(true);
         BorderPane.setMargin(left, new Insets(0, 6, 0, 6));
         BorderPane.setAlignment(left, Pos.CENTER_LEFT);