fix: selected icon highlight with color_devicons to false (#2187)

lua/telescope/config.lua

@@ -665,7 +665,7 @@ append(
   true,
   [[
   Boolean if devicons should be enabled or not. If set to false, the
-  "TelescopeResultsFileIcon" highlight group is used.
+  text highlight group is used.
   Hint: Coloring only works if |termguicolors| is enabled.
 
   Default: true]]

lua/telescope/utils.lua

@@ -452,7 +452,7 @@ utils.transform_devicons = load_once(function()
       if conf.color_devicons then
         return icon_display, icon_highlight
       else
-        return icon_display, "TelescopeResultsFileIcon"
+        return icon_display, nil
       end
     end
   else
@@ -480,7 +480,7 @@ utils.get_devicons = load_once(function()
       if conf.color_devicons then
         return icon, icon_highlight
       else
-        return icon, "TelescopeResultsFileIcon"
+        return icon, nil
       end
     end
   else