function updateScrollbars(theme) {
        theme = theme || {};
        if (prefs.get("themeScrollbars")) {
            var scrollbar = (theme.scrollbar || []).join(" ");
            $scrollbars.text(scrollbar || "");
        } else {
            $scrollbars.text("");
        }
    }
Load scrollbar styling based on whether or not theme scrollbars are enabled.

@param {ThemeManager.Theme} theme Is the theme object with the corresponding scrollbar style
  to be updated