add missing },{ so we get docker base back

There was a missing },{ between the two container images. The end result
is that pungi validates the config but only finds the last section so
only makes one of the two images

Signed-off-by: Dennis Gilmore <dennis@ausil.us>

fedora.conf

@@ -285,6 +285,8 @@ image_build = {
                     'subvariant': 'Docker_Base'
                     'failable': ['*'],
                     },
+        },
+        {
             'image-build': {
                     'format': [('docker', 'tar.xz')]
                     'name': 'Fedora-Container-Minimal-Base',