g.extension: fix https://trac.osgeo.org/grass/changeset/59640 (missing commas)

git-svn-id: https://svn.osgeo.org/grass/grass/branches/releasebranch_7_0@59641 15284696-431f-4ddb-bdfa-cd5b030d7da7

scripts/g.extension/g.extension.py

@@ -690,7 +690,7 @@ def install_extension_xml(url, mlist):
 def install_extension_win(name):
     ### do not use hardcoded url - http://wingrass.fsv.cvut.cz/grassXX/addonsX.X.X
     grass.message(_("Downloading precompiled GRASS Addons <%s>...") % options['extension'])
-    url = "http://wingrass.fsv.cvut.cz/grass%s%s/addons/grass-%s%s%s/" % \
+    url = "http://wingrass.fsv.cvut.cz/grass%s%s/addons/grass-%s.%s.%s/" % \
         (version[0], version[1], version[0], version[1], version[2])
     
     grass.debug("url=%s" % url, 1)