Signature help may not respect capabilities for `NoActiveParameterSupport`

[DanielRosenwasser]

Current code for signature help has the following:

var activeParameter *lsproto.UintegerOrNull
if argumentInfo.argumentIndex == nil {
	if clientOptions.SignatureInformation.NoActiveParameterSupport != nil && *clientOptions.SignatureInformation.NoActiveParameterSupport {
		activeParameter = nil
	}
} else {
	activeParameter = &lsproto.UintegerOrNull{Uinteger: ptrTo(uint32(*argumentInfo.argumentIndex))}
}

I think there's a bug because it needs to be set to 0 or something if NoActiveParameterSupport is not set or is set to true.

Should have a test that (un)sets that capability.