Add missing newline to py-breakpoint.c

In https://sourceware.org/ml/gdb-patches/2016-07/msg00152.html,
Yao noted that a patch of mine was missing a newline.

I thought I had fixed this but when looking today I realized it was
not fixed.  This patch adds it.

I'm checking this in as obvious.

2016-07-14  Tom Tromey  <tom@tromey.com>

	* python/py-breakpoint.c (gdbpy_breakpoint_deleted): Add missing
	newline.