obey zenburn_italic_Comment in gui mode

[mwcz]

Hi, happy zenburn user of >10 years here! I was just trying to remove italicized comments (cool feature, but Terminus doesn't look good italicized).

As far as I can tell, g:zenburn_italic_Comment is currently only obeyed in terminal mode. This changes the behavior so that italics in gui mode (nvim, gvim, vimx) is controlled by g:zenburn_italic_Comment as well.

I realize this change would remove italics from users who are using zenburn in nvim/gvim/vimx, but haven't set g:zenburn_italic_Comment = 1 because they didn't have to.

[jnurmine]

Hey, thanks for the fix! The italic Comment was indeed buggy (it was always italic).

For the record

• People who want italic comments should do g:zenburn_italic_Comment = 1
• Terminal users should check support with echo -e "\e[3m test \e[23m" prior to enabling; if the output is not italic, then italic won't work due to terminal limitation