Revert "Disable cache feature"

This reverts commit 9a597f2.

Author: Jack251970

Flow.Launcher/Helper/WallpaperPathRetrieval.cs

@@ -15,9 +15,8 @@ public static class WallpaperPathRetrieval
 {
     private static readonly string ClassName = nameof(WallpaperPathRetrieval);
 
-    // Disable cache feature because some wallpaper applications (like Wallpaper Engine) may change wallpaper frequently
-    private const int MaxCacheSize = 0;//3;
-    private static readonly Dictionary<(string, DateTime), ImageBrush> WallpaperCache = [];
+    private const int MaxCacheSize = 3;
+    private static readonly Dictionary<(string, DateTime), ImageBrush> WallpaperCache = new();
     private static readonly Lock CacheLock = new();
 
     public static Brush GetWallpaperBrush()