Add spelling fix for jfs@debian.org to .mailmap

.mailmap

@@ -1,6 +1,7 @@
 # Spell names properly
 Raphaël Hertzog <hertzog@debian.org>
 Nicolas François <nekral-guest@users.alioth.debian.org>
+Javier Fernández-Sanguino Peña <jfs@debian.org> <jfs@javifsp.no-ip.org>
 Javier Fernández-Sanguino Peña <jfs@debian.org>
 Eddy Petrișor <eddyp-guest@users.alioth.debian.org>
 Jiří Paleček <jpalecek@web.de>