Don't hardcode height in filter text box

Author: donokuda

src/GitHub.UI/Assets/Controls/FilterTextBox.xaml

@@ -13,7 +13,6 @@
         <Setter Property="AllowDrop" Value="true"/>
         <Setter Property="ScrollViewer.PanningMode" Value="VerticalFirst"/>
         <Setter Property="Stylus.IsFlicksEnabled" Value="False"/>
-        <Setter Property="Height" Value="24" />
         <Setter Property="Padding" Value="3,3,18,3" />
         <Setter Property="ContextMenu" Value="{DynamicResource DefaultContextMenu}" />
         <Setter Property="Template">

src/GitHub.VisualStudio/Styles/GitHubComboBox.xaml

@@ -40,7 +40,6 @@
                 <Setter Property="Foreground" Value="{DynamicResource GitHubVsWindowText}" />
                 <Setter Property="Background" Value="{DynamicResource GitHubVsBrandedUIBackground}" />
                 <Setter Property="Margin" Value="5" />
-                <Setter Property="Height" Value="25" />
             </Style>
 
             <Style TargetType="{x:Type ListBox}" BasedOn="{StaticResource {x:Type ListBox}}">