fix: Center align DynamicScrollBar Grid elements (#1676)

Author: Nuklon

src/Wpf.Ui/Controls/DynamicScrollBar/DynamicScrollBar.xaml

@@ -106,7 +106,7 @@
     </Style>
 
     <ControlTemplate x:Key="DynamicVerticalScrollBar" TargetType="{x:Type controls:DynamicScrollBar}">
-        <Grid>
+        <Grid HorizontalAlignment="Center">
             <Grid.RowDefinitions>
                 <RowDefinition MaxHeight="14" />
                 <RowDefinition Height="0.00001*" />
@@ -250,7 +250,7 @@
     </ControlTemplate>
 
     <ControlTemplate x:Key="DynamicHorizontalScrollBar" TargetType="{x:Type controls:DynamicScrollBar}">
-        <Grid>
+        <Grid VerticalAlignment="Center">
             <Grid.ColumnDefinitions>
                 <ColumnDefinition MaxWidth="18" />
                 <ColumnDefinition Width="0.00001*" />