Remove AutoCompleteListMaxHeight in favor of MaxDropDownHeight

src/Avalonia.Themes.Fluent/Accents/BaseDark.xaml

@@ -160,7 +160,6 @@
     <x:Double x:Key="AppBarThemeMinimalHeight">24</x:Double>
     <x:Double x:Key="AppBarThemeCompactHeight">40</x:Double>
     <x:Double x:Key="AppBarExpandButtonCircleDiameter">3</x:Double>
-    <x:Double x:Key="AutoCompleteListMaxHeight">374</x:Double>
     <x:Double x:Key="AutoCompleteListBorderOpacity">0</x:Double>
     <Thickness x:Key="CheckBoxBorderThemeThickness">2</Thickness>
     <Thickness x:Key="CheckBoxCheckedStrokeThickness">0</Thickness>

src/Avalonia.Themes.Fluent/Accents/BaseLight.xaml

@@ -159,7 +159,6 @@
     <x:Double x:Key="AppBarThemeMinimalHeight">24</x:Double>
     <x:Double x:Key="AppBarThemeCompactHeight">40</x:Double>
     <x:Double x:Key="AppBarExpandButtonCircleDiameter">3</x:Double>
-    <x:Double x:Key="AutoCompleteListMaxHeight">374</x:Double>
     <x:Double x:Key="AutoCompleteListBorderOpacity">0</x:Double>
     <Thickness x:Key="CheckBoxBorderThemeThickness">2</Thickness>
     <Thickness x:Key="CheckBoxCheckedStrokeThickness">0</Thickness>

src/Avalonia.Themes.Fluent/AutoCompleteBox.xaml

@@ -56,7 +56,6 @@
                        BorderThickness="0"
                        Foreground="{DynamicResource AutoCompleteBoxSuggestionsListForeground}"
                        ItemTemplate="{TemplateBinding ItemTemplate}"
-                       MaxHeight="{DynamicResource AutoCompleteListMaxHeight}"
                        Margin="{DynamicResource AutoCompleteListPadding}" />
             </Border>
           </Popup>