tidy the codes

src/Shared/HandyControl_Shared/Themes/Styles/ToolTip.xaml

@@ -1,5 +1,4 @@
 <ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
-                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                     xmlns:controls="clr-namespace:HandyControl.Controls">
 
     <Style TargetType="ToolTip">