fix: 删除两个MySQL的两个没用的，甚至是错的UINQUE KEY定义

sql/mysql/ruoyi-vue-pro.sql

@@ -1276,8 +1276,7 @@ CREATE TABLE `system_dict_type`  (
   `update_time` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '更新时间',
   `deleted` bit(1) NOT NULL DEFAULT b'0' COMMENT '是否删除',
   `deleted_time` datetime NULL DEFAULT NULL COMMENT '删除时间',
-  PRIMARY KEY (`id`) USING BTREE,
-  UNIQUE INDEX `dict_type`(`type` ASC) USING BTREE
+  PRIMARY KEY (`id`) USING BTREE
 ) ENGINE = InnoDB AUTO_INCREMENT = 620 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_unicode_ci COMMENT = '字典类型表';
 
 -- ----------------------------
@@ -5493,8 +5492,7 @@ CREATE TABLE `system_users`  (
   `update_time` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '更新时间',
   `deleted` bit(1) NOT NULL DEFAULT b'0' COMMENT '是否删除',
   `tenant_id` bigint NOT NULL DEFAULT 0 COMMENT '租户编号',
-  PRIMARY KEY (`id`) USING BTREE,
-  UNIQUE INDEX `idx_username`(`username` ASC, `update_time` ASC, `tenant_id` ASC) USING BTREE
+  PRIMARY KEY (`id`) USING BTREE
 ) ENGINE = InnoDB AUTO_INCREMENT = 131 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_unicode_ci COMMENT = '用户信息表';
 
 -- ----------------------------