fix: add margin for strokes

Author: punker76

src/IconPacks.Avalonia.Core/PackIconControlBase.axaml

@@ -45,6 +45,7 @@
             <Setter Property="StrokeJoin" Value="Round" />
             <Setter Property="Width" Value="24" />
             <Setter Property="Height" Value="24" />
+            <Setter Property="Margin" Value="1" />
         </Style>
 
         <!-- flipped icon data -->