[binutils-gdb] record: fix typo in "set record" output

[sergiodj+buildbot@sergiodj.net]

*** TEST RESULTS FOR COMMIT 69f90c75b369cd2d66988a67bbc2a000dd6b9816 ***

Author: Markus Metzger <markus.t.metzger@intel.com>
Branch: master
Commit: 69f90c75b369cd2d66988a67bbc2a000dd6b9816

record: fix typo in "set record" output

Alan Hayward pointed out a typo in the output of "set record btrace" that
I took from "set record".  Fix the original.

gdb/
	* record.c (set_record_command): Fix typo in message.