fix 修复 重新生成租户ID未生效的问题

Signed-off-by: 疯狂的狮子Li <15040126243@163.com>

ruoyi-modules/ruoyi-system/src/main/java/org/dromara/system/service/impl/SysTenantServiceImpl.java

@@ -203,7 +203,7 @@ public class SysTenantServiceImpl implements ISysTenantService {
         String numbers = RandomUtil.randomNumbers(6);
         // 判断是否存在，如果存在则重新生成
         if (tenantIds.contains(numbers)) {
-            generateTenantId(tenantIds);
+            return generateTenantId(tenantIds);
         }
         return numbers;
     }