fix: add sign column to winhl

lua/nvim-tree/colors.lua

@@ -75,6 +75,7 @@ local function get_links()
     LspDiagnosticsHint = "LspDiagnosticsDefaultHint",
     StatusLine = "StatusLine",
     StatusLineNC = "StatusLineNC",
+    SignColumn = 'SignColumn',
   }
 end
 

lua/nvim-tree/view.lua

@@ -30,6 +30,7 @@ M.View = {
       'VertSplit:NvimTreeVertSplit',
       'StatusLine:NvimTreeStatusLine',
       'StatusLineNC:NvimTreeStatuslineNC',
+      'SignColumn:NvimTreeSignColumn',
       'NormalNC:NormalNC'
     }, ',')
   },