fix(wm-common): 修复POM文件重复XML声明问题

wm-common/pom.xml

         <dependency><groupId>com.alibaba</groupId><artifactId>easyexcel</artifactId></dependency>
     <dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-validation</artifactId></dependency>
 </dependencies>
-</project><?xml version="1.0" encoding="UTF-8"?>
-<!-- overwrite -->
+</project>