新增用户名去掉trim

backend/src/main/java/com/jiayue/ssi/controller/SysUserController.java

@@ -158,7 +158,7 @@ public class SysUserController {
                 return ResponseVO.fail("用户账号不能为空!");
             }
             else {
-                username = user.getUsername().trim();
+                username = user.getUsername();
                 if (username.contains(" ")){
                     return ResponseVO.fail("账号中不能含有空格！");
                 }