nvim: plugin_settings: Drop tags as completion source for Haskell

Signed-off-by: Sanchayan Maity <maitysanchayan@gmail.com>

nvim/.config/nvim/plugin_settings.vim

@@ -66,7 +66,6 @@ let g:completion_chain_complete_list = {
   \ 'haskell': [
   \    {'complete_items': ['lsp']},
   \    {'mode': 'keyn'},
-  \    {'mode': 'tags'},
   \    {'mode': '<c-p>'},
   \    {'mode': '<c-n>'},
   \],