fix: remove diagnostics in help view

fixes #1088

lua/nvim-tree/actions/toggles.lua

@@ -2,6 +2,7 @@ local view = require "nvim-tree.view"
 local filters = require "nvim-tree.explorer.filters"
 local renderer = require "nvim-tree.renderer"
 local reloaders = require "nvim-tree.actions.reloaders"
+local diagnostics = require "nvim-tree.diagnostics"
 
 local M = {}
 
@@ -22,7 +23,12 @@ end
 
 function M.help()
   view.toggle_help()
-  return renderer.draw()
+  renderer.draw()
+  if view.is_help_ui() then
+    diagnostics.clear()
+  else
+    diagnostics.update()
+  end
 end
 
 return M