NewScanner with SetWsPattern does not skip whitespace when used with And

[etsangsplk]

I was expecting that two should be matched since it should escape the whitespace but it did not. Also the whitespace should be already be set by default which means that there should be no need to call SetWSPattern

	s := NewScanner([]byte("one two three")).SetWSPattern(" ")
	v, e := p(s)
	if v == nil {
		t.Errorf("End() didn't match %q", e)
	}```


Error message:
End() didn't match &{"one two three" '\x00' '\x01' map["^ ":%!q(*regexp.Regexp=&{^  0xc0003bef00 <nil> 0 65536 []  [] 0 0 0 2 false 4 1 false})] " " %!q(bool=false)}

There are few places in tokeniser where it calls SkipWS but not used that Scanner returned by that function. For example
https://github.com/prataprc/goparsec/blob/master/tokeniser.go#L85