fix syntax typo introduced in https://trac.osgeo.org/grass/changeset/67501

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@67502 15284696-431f-4ddb-bdfa-cd5b030d7da7

lib/init/grass.py

@@ -1364,7 +1364,7 @@ def close_gui():
         try:
             os.kill(int(pid), signal.SIGTERM)
         except OSError as e:
-            message(_("Unable to close GUI. {}".format(e)))
+            message(_("Unable to close GUI. {}").format(e))
         
 def clear_screen():
     """Clear terminal"""