gnucash maint: Fix typo

[Geert Janssens]

Updated	 via  https://github.com/Gnucash/gnucash/commit/92f28636 (commit)
	from  https://github.com/Gnucash/gnucash/commit/595dbbfb (commit)



commit 92f2863658d46f6aea297149d35966194dae3ae4
Author: Geert Janssens <janssens-geert at telenet.be>
Date:   Fri Jan 22 10:44:15 2016 +0100

    Fix typo



Summary of changes:
 src/optional/gtkmm/test/Makefile.am | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)