Use default fringe setting for git-gutter-fringe

That is: use the left fringe instead of the right fringe

contrib/git/packages.el

@@ -85,7 +85,6 @@ which require an initialization must be listed explicitly in the list.")
         "Lazy load git gutter and choose between fringe and no fringe."
         (when (display-graphic-p) (require 'git-gutter-fringe))
         (init-git-gutter))
-      (setq git-gutter-fr:side 'right-fringe)
       (add-to-hooks 'git/load-git-gutter '(markdown-mode-hook
                                            org-mode-hook
                                            prog-mode-hook)))