Make :Git open a tab to the left for :terminal

- Users of multiple tabs will find themselves back where they started
  when the terminal closes, instead of in the next tab over

plugin/fugitive.vim

@@ -704,7 +704,7 @@ function! s:Git(bang, args) abort
   let args = matchstr(a:args,'\v\C.{-}%($|\\@<!%(\\\\)*\|)@=')
   if exists(':terminal')
     let dir = s:repo().tree()
-    tabedit %
+    -tabedit %
     execute 'lcd' fnameescape(dir)
     execute 'terminal' git args
   else