fix mybatis plus多层级包扫描

Former-commit-id: 4ac1287ec40e56a67e1943123205fc5e91ce455f

Author: geekidea

src/main/java/io/geekidea/springbootplus/SpringBootPlusApplication.java

@@ -39,7 +39,7 @@
 @EnableTransactionManagement
 @EnableConfigurationProperties
 @SpringBootApplication
-@MapperScan({"io.geekidea.springbootplus.*.mapper"})
+@MapperScan({"io.geekidea.springbootplus.**.mapper"})
 public class SpringBootPlusApplication {
 
     public static void main(String[] args) {