Fix production queue numbers increasing needlessly.

OpenRA.Mods.Common/Widgets/ProductionTabsWidget.cs

@@ -36,6 +36,7 @@ namespace OpenRA.Mods.Common.Widgets
 		{
 			var queues = allQueues.Where(q => q.Info.Group == Group).ToList();
 			var tabs = new List<ProductionTab>();
+			var largestUsedName = 0;
 
 			// Remove stale queues
 			foreach (var t in Tabs)
@@ -45,8 +46,11 @@ namespace OpenRA.Mods.Common.Widgets
 
 				tabs.Add(t);
 				queues.Remove(t.Queue);
+				largestUsedName = Math.Max(int.Parse(t.Name), largestUsedName);
 			}
 
+			NextQueueName = largestUsedName + 1;
+
 			// Add new queues
 			foreach (var queue in queues)
 				tabs.Add(new ProductionTab()