[gnome-initial-setup] build: Fix a typo in configure help

[Kalev Lember <klember src gnome org>]

commit 3db87efa1eb9eb07f0a7eed8e36d309db941803f
Author: Kalev Lember <klember redhat com>
Date:   Mon Sep 5 10:48:12 2016 +0200

    build: Fix a typo in configure help

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 74b59c7..927aa4c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -54,7 +54,7 @@ PKG_CHECK_MODULES(INITIAL_SETUP,
 
 
 AC_ARG_ENABLE(software-sources,
-              [AS_HELP_STRING([--enable-software-source],
+              [AS_HELP_STRING([--enable-software-sources],
                               [enable software sources page])],,
               [enable_software_sources=no])