Fixing Symbol Display sample (#606)

* Switch cancelButton image to FontImageSource allowing for more flexible and scalable icon usage (#593)

* Switch cancelButton image to FontImageSource allowing for more flexible and scalable icon usage with support for Dark/Light mode fixes.

* Update cancelButton icon color to #6E6E6E
Removed unused resources.

* Add platform-specific min size for SymbolDisplay on Android to fix issue with Pixel 4 rendering.

* Reverting changing height and width and removing Border to resolve the issue

* Fixing SymbolDisplay on Android Pixel 4 device by removing Border element

src/Samples/Toolkit.SampleApp.Maui/Samples/SymbolDisplaySample.xaml.cs

@@ -38,23 +38,14 @@ private void AddSymbol(Symbol symbol)
         {
             int columnCount = LayoutRoot.ColumnDefinitions.Count;
             var sd = new SymbolDisplay() { Symbol = symbol };
-            Border border = new Border()
-            {
-                HorizontalOptions = LayoutOptions.Center,
-                VerticalOptions = LayoutOptions.Center,
-                Padding = 0,
-                StrokeThickness = 1,
-            };
-            border.SetAppThemeColor(Microsoft.Maui.Controls.Border.StrokeProperty, Colors.Black, Colors.White);
-            border.Content = sd;
             int count = LayoutRoot.Children.Count;
             var row = count / columnCount;
             var column = count % columnCount;
             if (column == 0)
                 LayoutRoot.RowDefinitions.Add(new RowDefinition());
-            Grid.SetRow(border, row);
-            Grid.SetColumn(border, column);
-            LayoutRoot.Children.Add(border);
+            Grid.SetRow(sd, row);
+            Grid.SetColumn(sd, column);
+            LayoutRoot.Children.Add(sd);
         }
     }
 }