keyword: fix utcdate filter

So far the utcdate filter only omitted the timezone,
now it actually converts to utc.

Thanks to Kevin Grover for pointing out the issue.

hgext/keyword.py

@@ -97,7 +97,7 b" restricted = ('merge record resolve qfol"
               ' transplant')
 
 # provide cvs-like UTC date filter
-utcdate = lambda x: util.datestr(x, '%Y/%m/%d %H:%M:%S')
+utcdate = lambda x: util.datestr((x[0], 0), '%Y/%m/%d %H:%M:%S')
 
 # make keyword tools accessible
 kwtools = {'templater': None, 'hgcmd': '', 'inc': [], 'exc': ['.hg*']}