Revert "Prefer LightRenderer over tcell on Windows"

This reverts commit dca2262.

> For mouse support on mintty
> Fix #3847

The current implementation LightRenderer for Windows is unable to accept
non-ASCII input unlike the tcell renderer. So even though it supports
mouse on mintty, we shouldn't use it as the default.

* #3799
* #3847

src/terminal.go

@@ -728,7 +728,7 @@ func NewTerminal(opts *Options, eventBox *util.EventBox, executor *util.Executor
  }
  }
  if fullscreen {
- if !tui.IsLightRendererSupported() {
+ if tui.HasFullscreenRenderer() {
  renderer = tui.NewFullscreenRenderer(opts.Theme, opts.Black, opts.Mouse)
  } else {
  renderer, err = tui.NewLightRenderer(ttyin, opts.Theme, opts.Black, opts.Mouse, opts.Tabstop, opts.ClearOnExit,