fix: add normalNC color group

fixes #709

Author: kyazdani42

lua/nvim-tree/colors.lua

@@ -57,6 +57,7 @@ local function get_links()
     EmptyFolderName = 'Directory',
     OpenedFolderName = 'Directory',
     Normal = 'Normal',
+    NormalNC = 'NormalNC',
     EndOfBuffer = 'EndOfBuffer',
     CursorLine = 'CursorLine',
     VertSplit = 'VertSplit',

lua/nvim-tree/view.lua

@@ -31,7 +31,7 @@ M.View = {
       'StatusLine:NvimTreeStatusLine',
       'StatusLineNC:NvimTreeStatuslineNC',
       'SignColumn:NvimTreeSignColumn',
-      'NormalNC:NormalNC'
+      'NormalNC:NvimTreeNormalNC',
     }, ',')
   },
   bufopts = {