typo in search UI

[devoncarew]

There's a typo in the code applying css styles to the seach UI:

web/search.dart:        ..classes.add('seach-options')

I didn't correct it however as I don't see any css values for seach-options or search-options, so am not sure what the best fix is (correct the typo? remove applying the style? correct to a newer css style name?).

[srawlins]

Odd. Probably dead code. @parlough cleaned up a lot of CSS rules recently, but I don't see search-options in that change. ed56883

[parlough]

Looks like it was added unused in #3129. Seems safe to remove.