Removed hardcoded height in FilterTextBox template.

Author: Steven Kirk

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">