CategoryServiceImpl: remove unused import.

Should be in 1f15395 commit.

Reported by CheckStyle.

No functional changes.

Author: php-coder

src/main/java/ru/mystamps/web/service/CategoryServiceImpl.java

@@ -36,7 +36,6 @@
 import ru.mystamps.web.dao.CategoryDao;
 import ru.mystamps.web.dao.dto.AddCategoryDbDto;
 import ru.mystamps.web.dao.dto.LinkEntityDto;
-import ru.mystamps.web.dao.dto.UrlEntityDto;
 import ru.mystamps.web.service.dto.AddCategoryDto;
 import ru.mystamps.web.support.spring.security.HasAuthority;
 import ru.mystamps.web.util.LocaleUtils;