init.el: Fix bugs in Haskell mode config

Do not start intero automatically. Intero's whitelist and
blacklist feature does not really work and creates problems
for non intero/stack projects. Remove go format call with
before-save hook as it resulted in go format being called
on a file before saving and changing the major mode.

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

init.el

@@ -641,14 +641,15 @@
              :hook
              ((haskell-mode . hindent-mode)
               (haskell-mode . company-mode)
-              (haskell-mode . interactive-haskell-mode))
+              (haskell-mode . interactive-haskell-mode)
+              (haskell-mode . #'flycheck-haskell-setup))
              :custom
              ((haskell-stylish-on-save t)
               (haskell-process-suggest-remove-import-lines t)))
+(use-package flycheck-haskell
+             :defer t)
 (use-package intero
-             :defer t
-             :hook
-             (haskell-mode . intero-mode))
+             :defer t)
 (use-package hindent
              :defer t)
 (use-package hlint-refactor
@@ -725,7 +726,6 @@
              :init
              (setq-local tab-width 8)
              :hook
-             ((before-save . 'gofmt-before-save)
-              (go-mode . company-mode)))
+             (go-mode . company-mode))
 
 ;;; init.el ends