updateById 수정하기

- 삭제 성공했으면 1을 return 해주기
- 삭제 실패했으면 0을 return 해주기

Related to: #37

src/main/java/com/example/naverrestaurant/db/H2DbRepositoryAbstract.java

@@ -66,7 +66,12 @@ public void deleteById(int index) {
         String deleteByIdQuery = "delete from restaurant where index=?";
         int deleteByIdParam = index;
         int result = this.jdbcTemplate.update(deleteByIdQuery, deleteByIdParam);
-        System.out.println("delete : "+result);
+        if(result==1){
+            System.out.println("delete success");
+        }
+        else if(result==0){
+            System.out.println("delete fail");
+        }
     }
 
     @Override