fix: configuration update column thumbnail ignored

 package org.thingsboard.server.dao.yunteng.entities;
 
+import com.baomidou.mybatisplus.annotation.FieldStrategy;
+import com.baomidou.mybatisplus.annotation.TableField;
 import com.baomidou.mybatisplus.annotation.TableName;
 import lombok.Data;
 import lombok.EqualsAndHashCode;
@@ -14,5 +16,6 @@ public class TkConfigurationCenterEntity extends TenantBaseEntity {
   private String remark;
   private String organizationId;
   private String platform;
+  @TableField(updateStrategy = FieldStrategy.IGNORED)
   private String thumbnail;
 }