fresh: NonText as SpecialKey

Don't use `set highlight` to highlight `NonText` like `SpecialKey`,
instead simply set the color of `NonText` in the colorscheme.

colors/fresh.vim

@@ -112,7 +112,7 @@ if has('gui_running') || &t_Co == 256
   call s:hi('MatchParen', '', '', '')
   call s:hi('ModeMsg', '', '', '')
   call s:hi('MoreMsg', '12', '', '')
-  call s:hi('NonText', '', '', '')
+  call s:hi('NonText', '238', '', '')
   call s:hi('Normal', '7', '232', '')
   call s:hi('Pmenu', '', '235', '')
   call s:hi('PmenuSel', '', '', 'reverse')

plugin/settings.vim

@@ -68,8 +68,6 @@ if has('linebreak')
   set linebreak
   " Downwards Arrow With Tip Rightwards (U+21B3, utf-8: E2 86 B3)
   let &showbreak='↳ '
-  " Use same highlight group as listchars for showbreak
-  set highlight+=@:SpecialKey
 endif
 
 " TODO: spellcapcheck