message: fix(Search): style error in dark mode
diff: body {
  --van-search-padding: 10px var(--van-padding-sm);
  --van-search-background: var(--van-background-2);
  - --van-search-content-background: var(--van-gray-1);
  + --van-search-content-background: var(--van-background);
  --van-search-input-height: 34px;
  --van-search-label-padding: 0 5px;
  --van-search-label-color: var(--van-text-color);
  