Fix action numbers (/handle UI default theme update) (#15840)

Co-authored-by: metalgearsloth <comedian_vs_clown@hotmail.com>

Content.Client/UserInterface/Controls/SlotControl.cs

@@ -232,6 +232,7 @@ namespace Content.Client.UserInterface.Controls
 
         protected override void OnThemeUpdated()
         {
+            base.OnThemeUpdated();
             StorageButton.TextureNormal = Theme.ResolveTexture(_storageTexturePath);
             ButtonRect.Texture = Theme.ResolveTexture(_buttonTexturePath);
             HighlightRect.Texture = Theme.ResolveTexture(_highlightTexturePath);