fixed scrollbar overwriting window borders on wayland

[WerIstLuka]

the scrollbar overwrites the window border on wayland
creating a 1px transparent border around the scrollbar fixes it

mint-l has the same issue, i also made a pr there with the same change

i opened a wayland issue on this a while ago, fixed it for my theme and closed the issue but forgot to fix it for mint-y and mint-l linuxmint/wayland#156

[echuber2]

I wonder if this fix is needed for other types of windows that might not have typical borders. Is there a way to generalize it without constraining it to the terminal style? What about adding padding (or maybe margin) around the scrollbar instead of an invisible border?

[WerIstLuka]

i've been daily driving the wayland session for a while now and i havn't seen any other window with this issue

i fixed this issue a few weeks ago but forgot to make a pr so i have no idea why i chose to make an invisible border. margin or padding might also work but i just copied what i did with my theme to fix it