Fix: highlight exact match folders names not working

Author: tiagofumo

after/syntax/nerdtree.vim

@@ -495,7 +495,7 @@ for [key, val] in items(g:NERDTreeExactMatchHighlightColor)
   exec 'silent syn match '.label_identifier.' "\c'.key.'$" containedin=NERDTreeFile'
   exec 'silent syn match '.label_identifier.' "\c'.key.'\W*\*$" containedin=NERDTreeExecFile'
   exec 'hi def link '.label_identifier.' NERDTreeFile'
-  exec 'silent syn match '.folder_identifier.' "\v\c<'.key.'\ze\/" containedin=NERDTreeFlags'
+  exec 'silent syn match '.folder_identifier.' "\v\c<'.key.'\ze\/" containedin=NERDTreeDir'
   exec 'hi def link '.folder_identifier.' NERDTreeFlags'
   if exists('g:WebDevIconsUnicodeDecorateFileNodesExactSymbols["'.key.'"]')
     let icon = g:WebDevIconsUnicodeDecorateFileNodesExactSymbols[key]