feat: improve mandatory update button (use secondary)

Author: paul-fresquet

src/ByteSync.Client/Assets/Themes/GeneralStyles.axaml

@@ -175,6 +175,14 @@
 	    <Setter Property="Background" Value="{DynamicResource BsAccentButtonPointerOverBackGround}" />
     </Style>
 
+    <Style Selector="Button.Secondary">
+	    <Setter Property="Background" Value="{DynamicResource SecondaryButtonBackGround}"/>
+    </Style>
+    
+    <Style Selector="Button.Secondary:pointerover > ContentPresenter#PART_ContentPresenter2">
+	    <Setter Property="Background" Value="{DynamicResource SecondaryButtonPointerOverBackGround}" />
+    </Style>
+    
     <!-- SEPARATOR -->
     <!-- SEPARATOR -->
     <!-- SEPARATOR -->

src/ByteSync.Client/Views/Headers/HeaderView.axaml

@@ -51,7 +51,7 @@
                             IsVisible="{Binding ShowUpdateObservable}"
                             HorizontalAlignment="Left"
                             Classes.GenericButton="True"
-                            Classes.Accent="{Binding IsAVersionMandatory}">
+                            Classes.Secondary="{Binding IsAVersionMandatory}">
 
                         <StackPanel Orientation="Horizontal">
                             <StackPanel IsVisible="{Binding !IsAVersionMandatory}">