devicons: remove parentheses around symbols

autoload/startify.vim

@@ -440,7 +440,7 @@ function! s:display_by_path(path_prefix, path_format, use_env) abort
 
   let entry_format = "'   ['. index .']'. repeat(' ', (3 - strlen(index)))"
   if exists('*WebDevIconsGetFileTypeSymbol')  " support for vim-devicons
-    let entry_format .= ". '('. WebDevIconsGetFileTypeSymbol(entry_path) .') '. entry_path"
+    let entry_format .= ". WebDevIconsGetFileTypeSymbol(entry_path) .' '.  entry_path"
   else
     let entry_format .= '. entry_path'
   endif