optimize: remove unnecessary bindable objects

Pixiview.iOS/Renderers/AppShellRenderer.cs

@@ -20,6 +20,7 @@ namespace Pixiview.iOS.Renderers
             if (renderer is ShellSectionRenderer sr && Element is AppShell shell)
             {
                 shell.SetNavigationBarHeight(sr.NavigationBar.Frame.Height);
+                shell.SetStatusBarHeight(UIApplication.SharedApplication.StatusBarFrame.Height);
             }
             return renderer;
         }

Pixiview.iOS/Renderers/BlurryPanelRenderer.cs

@@ -32,6 +32,7 @@ namespace Pixiview.iOS.Renderers
 
             if (e.NewElement != null)
             {
+                e.NewElement.BackgroundColor = Color.Default;
                 if (Control == null)
                 {
                     var blur = UIBlurEffect.FromStyle(UIBlurEffectStyle.SystemMaterial);