fix: Consolidates Color/Center html (#1762)

### Summary
- Fixes bad color in virtual check gump
- Consolidates the Color/Center html strings for all gumps

Projects/UOContent/Items/Aquarium/Aquarium.cs

@@ -4,7 +4,6 @@ using ModernUO.Serialization;
 using Server.ContextMenus;
 using Server.Multis;
 using Server.Network;
-using Server.Utilities;
 
 namespace Server.Items
 {

Projects/UOContent/Items/Aquarium/AquariumGump.cs

@@ -57,7 +57,7 @@ namespace Server.Items
             AddItem(150, 80, item.ItemID, item.Hue);
 
             // item number / all items
-            AddHtml(20, 195, 250, 20, $"<BASEFONT COLOR=#FFFFFF>{page}/{m_Aquarium.Items.Count}</BASEFONT>");
+            AddHtml(20, 195, 250, 20, $"{page}/{m_Aquarium.Items.Count}".Color(0xFFFFFF));
 
             // remove item
             if (edit)