It's not really a good idea to drop back a version for something like that!
You can still scroll up or down with the up and down arrows of your keyboard or page up or down!
Anyway, you could try editing the gtk-widgets.css file of your gtk3 theme to change
Code:
-GtkScrollbar-has-backward-stepper: false;
-GtkScrollbar-has-forward-stepper: false;
to
Code:
-GtkScrollbar-has-backward-stepper: true;
-GtkScrollbar-has-forward-stepper: true;
This, of course, assumes that your theme supports arrows in scrollbars.
On an unrelated note, you may also want to edit ~/.config/gtk3/settings.ini to include
Code:
gtk-primary-button-warps-slider=false
to enable legacy scrolling.
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