Don't let TRAMP use auth-sources when completing input

This is unnecessary and potentially annoying.

init.el

@@ -569,7 +569,8 @@
               browse-url-generic-program "firefox"))
 
 (use-package tramp
-  :init (setq tramp-default-method (if on-windows "pscp" "scp")))
+  :init (setq tramp-default-method (if on-windows "pscp" "scp")
+              tramp-completion-use-auth-sources nil))
 
 (use-package calc
   ;; https://florian.adamsky.it/2016/03/31/emacs-calc-for-programmers-and-cs.html
@@ -2010,7 +2011,8 @@
               ("<C-tab>" . dired-subtree-cycle))
   :init (progn
           (setq dired-dwim-target t
-                dired-listing-switches (if on-windows "-aGFhlv" "-aGFhlv --group-directories-first --time-style=long-iso")
+                dired-listing-switches "-ahlvF"
+                dired-ls-F-marks-symlinks t
                 dired-hide-details-hide-information-lines t
                 dired-hide-details-hide-symlink-targets t
                 dired-recursive-copies 'top