fix - Fixed debug display for calendar

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The debug display for calendar instances should have the closing box
quotes.

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Type: fix
Breaking: False
Doc Required: False
Backport Required: False
Part: 1/1

public/VisualCard.Calendar/Parts/Calendar.cs

@@ -40,7 +40,7 @@ namespace VisualCard.Calendar.Parts
     /// <summary>
     /// A vCalendar card instance
     /// </summary>
-    [DebuggerDisplay("vCalendar version {CalendarVersion.ToString()}, parts: (A [{partsArray.Count}] | S [{strings.Count} | I [{integers.Count}])")]
+    [DebuggerDisplay("vCalendar version {CalendarVersion.ToString()}, parts: (A [{partsArray.Count}] | S [{strings.Count}] | I [{integers.Count}])")]
     public class Calendar : IEquatable<Calendar>
     {
         internal readonly List<CalendarEvent> events = [];