static/frontend/homepage: fix symbols selector
Remove unnecessary "s" from query param.
For golang/go#44142
Trust: Julie Qiu
Run-TryBot: Julie Qiu
TryBot-Result: kokoro
{{if .Experiments.IsActive "symbol-search"}}
<select name="m" class="go-Select">
<option value="packages">Packages</option>
- <option value="{{.SearchModeSymbol}}s">{{capitalize .SearchModeSymbol}}s</option>
+ <option value="{{.SearchModeSymbol}}">{{capitalize .SearchModeSymbol}}s</option>
</select>
{{end}}
<input
