Fix accordion issue

This fixes the issue in accordion mode where the current line wasn't in the viewport upon focus.

It doesn't perfectly fix it: the current line always appears at the top of the view. But it's good enough
to cut a new release. The proper fix is to only focus the line after the view has had its height adjusted.

vendor/github.com/jesseduffield/gocui/view.go

@@ -269,7 +269,7 @@ func (v *View) FocusPoint(cx int, cy int) {
 	_, height := v.Size()
 
 	ly := height - 1
-	if ly == -1 {
+	if ly < 0 {
 		ly = 0
 	}