Strip whitespace from changeset description in changeset_templater.

changeset_printer already does this, too.

mercurial/cmdutil.py

@@ -966,7 +966,7 b' class changeset_templater(changeset_prin'
             'author': changes[1],
             'branches': showbranches,
             'date': changes[2],
-            'desc': changes[4],
+            'desc': changes[4].strip(),
             'file_adds': showadds,
             'file_dels': showdels,
             'files': showfiles,