ux: always enable Clear stashes button just like Discard all changes button

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

Author: love-linger

src/Views/Repository.axaml

@@ -158,7 +158,6 @@
                           Classes="icon_button"
                           Width="26" Height="26"
                           Command="{Binding ClearStashes}"
-                          IsEnabled="{Binding StashesCount, Converter={x:Static c:IntConverters.IsGreaterThanZero}}"
                           ToolTip.Tip="{DynamicResource Text.Repository.ClearStashes}">
                     <Path Width="12" Height="12" Data="{StaticResource Icons.RemoveAll}"/>
                   </Button>