ChartsOrg#3857 Defer the update of value be done after returning the…

… current value.

Source/Charts/Renderers/BarLineScatterCandleBubbleRenderer.swift

@@ -111,8 +111,8 @@ extension BarLineScatterCandleBubbleRenderer.XBounds: Sequence {
         }
 
         public mutating func next() -> Int? {
+            defer { value += 1 }
             guard value < bounds.max else { return  nil }
-            value += 1
             return value
         }
     }