delete some unnecessary codes

OTSIncAReportApp/Control_Grids/ParticlesGridDevidePage.cs

@@ -1297,7 +1297,6 @@ namespace OTSIncAReportGrids
             btnGo.Enabled = true;
         }
 
-        bool isTextChanged = false;
         /// <summary>
         /// 分页属性改变了。
         /// </summary>