chore(slider): remove unused Taro import; fix cover pagination position

- Drop unused getCurrentInstance/Taro import from slider widget
- .slider-pagination.cover: use bottom:0 instead of width/position reset

Made-with: Cursor

src/pages/home/wgts/slider.js

@@ -3,7 +3,6 @@
  * See LICENSE file for license details.
  */
 import React, { Component, useEffect } from 'react'
-import Taro, { getCurrentInstance } from '@tarojs/taro'
 import { View, Image, Text, Swiper, SwiperItem } from '@tarojs/components'
 import { SpImage, SpLogin } from '@/components'
 import { useImmer } from 'use-immer'

src/pages/home/wgts/slider/index.scss

@@ -86,8 +86,7 @@
     right: 0;
 
     &.cover {
-      width: 100%;
-      position: initial;
+      bottom: 0px;
     }
 
     &.left {