graphlog: do not bypass commands.log so that -fr works

Since 8b4b9ee6001a, opts dict can be modified in commands.log() before calling
cmdutil.graphlog().

hgext/graphlog.py

@@ -54,4 +54,5 b' def graphlog(ui, repo, *pats, **opts):'
     Nodes printed as an @ character are parents of the working
     directory.
     """
-    return cmdutil.graphlog(ui, repo, *pats, **opts)
+    opts['graph'] = True
+    return commands.log(ui, repo, *pats, **opts)

tests/test-glog.t

@@ -2243,6 +2243,14 b' Test --follow-first and backward --rev'
         ('symbol', 'rev')
         ('symbol', '6'))))
 
+Test --follow with --rev of graphlog extension
+
+  $ hg --config extensions.graphlog= glog -qfr1
+  o  1:216d4c92cf98
+  |
+  o  0:f8035bb17114
+  
+
 Test subdir
 
   $ hg up -q 3