feat: Support hide scrollbar for view

[nfwyst]

add an scrollbar option for views like:

      views = {
        hover = {
          scrollbar = false,
        }
      },

that is good situation when i know there is something more or not, and save some columns of screen

[folke]

I renamed the option to just scrollbar. Set to scrollbar=false to disable.

Thanks!

[yoplat]

I renamed the option to just scrollbar. Set to scrollbar=false to disable.

Thanks!

Can this be added to cmdline_popupmenu as well? It doesn't seem to be an option for that thanks.