Fix Fluent theme port bugs

src/Avalonia.Controls.DataGrid/Themes/Fluent.xaml

@@ -53,7 +53,6 @@
       <Setter Property="VerticalAlignment" Value="Center" />
     </ControlTheme>
     <ControlTheme x:Key="DataGridCellTextBoxTheme" TargetType="TextBox" BasedOn="{StaticResource {x:Type TextBox}}">
-      <Setter Property="Margin" Value="12,0,12,0" />
       <Setter Property="VerticalAlignment" Value="Stretch" />
       <Setter Property="Background" Value="Transparent" />
       <Style Selector="^ /template/ DataValidationErrors">

src/Avalonia.Themes.Fluent/Controls/ButtonSpinner.xaml

@@ -65,6 +65,7 @@
     </Style>
 
     <Style Selector="^:disabled /template/ ContentPresenter#PART_ContentPresenter">
+      <Setter Property="Background" Value="{DynamicResource RepeatButtonBackgroundDisabled}" />
       <Setter Property="Foreground" Value="{DynamicResource RepeatButtonForegroundDisabled}" />
     </Style>
   </ControlTheme>

src/Avalonia.Themes.Fluent/Controls/DatePicker.xaml

@@ -56,18 +56,11 @@
       </ControlTemplate>
     </Setter>
     
-    <Style Selector="^:pointerover /template/ ContentPresenter#PART_ContentPresenter">
-      <Setter Property="BorderBrush" Value="{DynamicResource DatePickerButtonBorderBrushPointerOver}"/>
-      <Setter Property="Background" Value="{DynamicResource DatePickerButtonBackgroundPointerOver}"/>
-      <Setter Property="Foreground" Value="{DynamicResource DatePickerButtonForegroundPointerOver}"/>
-    </Style>
-    
     <Style Selector="^:pressed">
       <Setter Property="RenderTransform" Value="scale(0.98)" />
     </Style>
     
     <Style Selector="^:pressed /template/ ContentPresenter#PART_ContentPresenter">
-      <Setter Property="BorderBrush" Value="{DynamicResource DatePickerButtonBorderBrushPressed}"/>
       <Setter Property="Background" Value="{DynamicResource DatePickerButtonBackgroundPressed}"/>
       <Setter Property="Foreground" Value="{DynamicResource DatePickerButtonForegroundPressed}"/>
     </Style>

src/Avalonia.Themes.Fluent/Controls/TimePicker.xaml

@@ -55,18 +55,11 @@
       </ControlTemplate>
     </Setter>
 
-    <Style Selector="^:pointerover /template/ ContentPresenter#PART_ContentPresenter">
-      <Setter Property="BorderBrush" Value="{DynamicResource TimePickerButtonBorderBrushPointerOver}"/>
-      <Setter Property="Background" Value="{DynamicResource TimePickerButtonBackgroundPointerOver}"/>
-      <Setter Property="Foreground" Value="{DynamicResource TimePickerButtonForegroundPointerOver}"/>
-    </Style>
-
     <Style Selector="^:pressed">
       <Setter Property="RenderTransform" Value="scale(0.98)" />
     </Style>
 
     <Style Selector="^:pressed /template/ ContentPresenter#PART_ContentPresenter">
-      <Setter Property="BorderBrush" Value="{DynamicResource TimePickerButtonBorderBrushPressed}"/>
       <Setter Property="Background" Value="{DynamicResource TimePickerButtonBackgroundPressed}"/>
       <Setter Property="Foreground" Value="{DynamicResource TimePickerButtonForegroundPressed}"/>
     </Style>