ux: use monospaced font for commit's SHA in commit list

Signed-off-by: leo <longshuang@msn.cn>

Author: love-linger

src/Views/Histories.axaml

@@ -183,6 +183,7 @@
               <DataTemplate DataType="m:Commit">
                 <Border Padding="8,0,0,0" Background="Transparent" ClipToBounds="True">
                   <TextBlock Text="{Binding SHA, Converter={x:Static c:StringConverters.ToShortSHA}}"
+                             FontFamily="{DynamicResource Fonts.Monospace}"
                              FontWeight="{Binding IsCurrentHead, Converter={x:Static c:BoolConverters.IsBoldToFontWeight}}"
                              Opacity="{Binding IsMerged, Converter={x:Static c:BoolConverters.IsMergedToOpacity}}"/>
                 </Border>