Reversed the way options are browsed inside fzf.

[PranavPeshwe]

Currently, cursor movement in the left pane is bottom-to-top, while movement in the right pane is top-to-bottom. It seemed a bit odd hence introduced this change.

Current: https://asciinema.org/a/Q1t5M5BhMo6n83vTps65lYkhx

After layout reversal: https://asciinema.org/a/AELf8GNNg9v4dJBl5lfzzJt8F

Perhaps, we can introduce an env var to control this.

[PranavPeshwe]

@BartSte Request review.

[BartSte]

Good catch. I had --reverse configured in my FZF_DEFAULT_OPTS but we should make it the default. There is no need to ad another environment variable as this can also be configured using FZF_HELP_OPTS.