fix 修复多租户下注册用户BUG

ruoyi-admin/src/main/java/com/ruoyi/web/controller/SysRegisterController.java

@@ -31,7 +31,7 @@ public class SysRegisterController extends BaseController {
     @SaIgnore
     @PostMapping("/register")
     public R<Void> register(@Validated @RequestBody RegisterBody user) {
-        if (!("true".equals(configService.selectConfigByKey("sys.account.registerUser")))) {
+        if (!configService.selectRegisterEnabled(user.getTenantId())) {
             return R.fail("当前系统没有开启注册功能！");
         }
         registerService.register(user);