Make `git k` and `git ka` pass down arguments to gitk

dotfiles/gittum/main.gitconfig

@@ -29,9 +29,9 @@
         --pretty=tformat:"%x1b[31m%h%x09%x1b[32m%d%x1b[0m%x20%s%x1b[0m"\
         --simplify-by-decoration
   k = !sh -c \
-      '(which gitk >/dev/null || (echo "gitk not installed" && false)) && gitk'
+      '(which gitk >/dev/null || (echo "gitk not installed" && false)) && gitk $@' --
   ka = !sh -c \
-       '(which gitk >/dev/null || (echo "gitk not installed" && false)) && gitk --all'
+       '(which gitk >/dev/null || (echo "gitk not installed" && false)) && gitk $@ --all' --
   rb = rebase
   rbi = rebase --interactive
   rmv = remote --verbose