在builder构建中，添加tableName的初始化

Author: Ngone51

src/main/java/tk/mybatis/mapper/entity/Example.java

@@ -118,6 +118,7 @@ private Example(Builder builder) {
         this.excludeColumns = builder.excludeColumns;
         this.oredCriteria = builder.exampleCriterias;
         this.forUpdate = builder.forUpdate;
+        this.tableName = builder.tableName;
 
         if (!StringUtil.isEmpty(builder.orderByClause.toString())) {
             this.orderByClause = builder.orderByClause.toString();