Revert "Prefer LightRenderer on Windows if it's available"

This reverts commit 7915e365b3
due to https://github.com/junegunn/fzf.vim/issues/1152#issuecomment-719696495.

src/terminal.go

@@ -408,11 +408,11 @@ func NewTerminal(opts *Options, eventBox *util.EventBox) *Terminal {
 	var renderer tui.Renderer
 	fullscreen := opts.Height.size == 0 || opts.Height.percent && opts.Height.size == 100
 	if fullscreen {
-		if tui.IsLightRendererSupported() {
+		if tui.HasFullscreenRenderer() {
+			renderer = tui.NewFullscreenRenderer(opts.Theme, opts.Black, opts.Mouse)
+		} else {
 			renderer = tui.NewLightRenderer(opts.Theme, opts.Black, opts.Mouse, opts.Tabstop, opts.ClearOnExit,
 				true, func(h int) int { return h })
-		} else {
-			renderer = tui.NewFullscreenRenderer(opts.Theme, opts.Black, opts.Mouse)
 		}
 	} else {
 		maxHeightFunc := func(termHeight int) int {

src/tui/dummy.go

@@ -6,6 +6,10 @@ package tui
 
 type Attr int
 
+func HasFullscreenRenderer() bool {
+	return false
+}
+
 func (a Attr) Merge(b Attr) Attr {
 	return a | b
 }

src/tui/tcell.go

@@ -15,6 +15,10 @@ import (
 	"github.com/mattn/go-runewidth"
 )
 
+func HasFullscreenRenderer() bool {
+	return true
+}
+
 func (p ColorPair) style() tcell.Style {
 	style := tcell.StyleDefault
 	return style.Foreground(tcell.Color(p.Fg())).Background(tcell.Color(p.Bg()))