Further RGB.NET updates

src/Artemis.Core/Services/CoreService.cs

@@ -258,10 +258,8 @@ namespace Artemis.Core.Services
 
         private void InvalidateBitmap()
         {
-
             lock (_bitmapLock)
             {
-                _bitmap?.Dispose();
                 _bitmap = null;
             }
         }

src/Artemis.Core/Services/DeviceService.cs

@@ -31,7 +31,7 @@ namespace Artemis.Core.Services
             Task.Run(async () =>
             {
                 await Task.Delay(200);
-                ledGroup.Detach(_rgbService.Surface);
+                ledGroup.Detach();
 
                 if (blinkCount < 5)
                 {

src/Artemis.Core/Services/RgbService.cs

@@ -136,8 +136,11 @@ namespace Artemis.Core.Services
 
         public void UpdateTexture(SKBitmap bitmap)
         {
+            SKTexture? oldTexture = Texture;
             Texture = new SKTexture(bitmap);
             TextureBrush.Texture = Texture;
+
+            oldTexture?.Dispose();
         }
 
         private void SurfaceOnLayoutChanged(SurfaceLayoutChangedEventArgs args) => UpdateLedGroup();
@@ -161,7 +164,7 @@ namespace Artemis.Core.Services
                 lock (_surfaceLedGroup)
                 {
                     // Clean up the old background
-                    _surfaceLedGroup.Detach(Surface);
+                    _surfaceLedGroup.Detach();
 
                     // Apply the application wide brush and decorator
                     _surfaceLedGroup = new ListLedGroup(Surface, LedMap.Select(l => l.Key)) { Brush = TextureBrush };