hgweb: remove an extra call to nodebranchnodefault() in changesetentry()

showbranch variable already contains the result of nodebranchnodefault(ctx), so
it can be reused.

mercurial/hgweb/webutil.py

@@ -331,7 +331,7 b' def changesetentry(web, req, tmpl, ctx):'
         archives=web.archivelist(ctx.hex()),
         tags=nodetagsdict(web.repo, ctx.node()),
         bookmarks=nodebookmarksdict(web.repo, ctx.node()),
-        branch=nodebranchnodefault(ctx),
+        branch=showbranch,
         inbranch=nodeinbranch(web.repo, ctx),
         branches=nodebranchdict(web.repo, ctx))