fix transition speed on list toggle

Author: ButchersBoy

MainDemo.Wpf/Buttons.xaml

@@ -280,7 +280,7 @@
                 </ToggleButton>
             </StackPanel>
 
-            <ListBox Grid.Column="1" Grid.Row="0" Style="{StaticResource MaterialDesignToolToggleListBox}">
+            <ListBox Grid.Column="1" Grid.Row="0" Style="{StaticResource MaterialDesignToolToggleListBox}" SelectedIndex="0">
                 <ListBox.ToolTip>
                     <StackPanel>
                         <TextBlock Text="MaterialDesignToolToggleListBox" />

MaterialDesignThemes.Wpf/Themes/MaterialDesignTheme.ListBox.xaml

@@ -76,7 +76,7 @@
                                         <Storyboard>
                                             <DoubleAnimation Storyboard.TargetName="SelectedBackgroundBorder"
                                                              Storyboard.TargetProperty="Opacity"
-                                                             To="0" Duration="1"/>
+                                                             To="0" Duration="0"/>
                                         </Storyboard>
                                     </VisualTransition>
                                 </VisualStateGroup.Transitions>