be more concise

Terminal.Gui/Views/ListView.cs

@@ -561,11 +561,7 @@ namespace Terminal.Gui {
 		/// <summary>
 		/// Gets the number of items in the <see cref="IList"/>.
 		/// </summary>
-		public int Count {
-			get {
-				return src?.Count != null ? src.Count : 0;
-			}
-		}
+		public int Count => src != null ? src.Count : 0;
 
 		void RenderUstr (ConsoleDriver driver, ustring ustr, int col, int line, int width)
 		{