fix(hues): do not use {} in nvim_set_hl for plugin groups

Details:
- This clears the highlight group which makes `hi default link Aaa Bbb`
  actually apply link and not leave `Aaa` cleared.
  Prefer to always supply something instead, usually link to other group
  (like `Normal`).

Related to #2047

Author: echasnovski

lua/mini/hues.lua

@@ -993,7 +993,7 @@ MiniHues.apply_palette = function(palette, plugins)
     hi('MiniStarterFooter',     { link='Comment' })
     hi('MiniStarterHeader',     { fg=p.accent,  bg=nil, bold=true })
     hi('MiniStarterInactive',   { link='Comment' })
-    hi('MiniStarterItem',       { fg=nil,       bg=nil })
+    hi('MiniStarterItem',       { link = 'Normal' })
     hi('MiniStarterItemBullet', { fg=p.fg_mid2, bg=nil })
     hi('MiniStarterItemPrefix', { fg=p.yellow,  bg=nil, bold=true })
     hi('MiniStarterSection',    { fg=p.purple,  bg=nil })