test-wireproto: move from dict() construction to {} literals

The latter are both faster and more consistent across Python 2 and 3.

tests/test-wireproto.py

@@ -1,48 +1,48 b''
 from mercurial import wireproto
 
 class proto(object):
     def __init__(self, args):
         self.args = args
     def getargs(self, spec):
         args = self.args
         args.setdefault('*', {})
         names = spec.split()
         return [args[n] for n in names]
 
 class clientpeer(wireproto.wirepeer):
     def __init__(self, serverrepo):
         self.serverrepo = serverrepo
     def _call(self, cmd, **args):
         return wireproto.dispatch(self.serverrepo, proto(args), cmd)
 
     @wireproto.batchable
     def greet(self, name):
         f = wireproto.future()
-        yield wireproto.todict(name=mangle(name)), f
+        yield {'name': mangle(name)}, f
         yield unmangle(f.value)
 
 class serverrepo(object):
     def greet(self, name):
         return "Hello, " + name
 
     def filtered(self, name):
         return self
 
 def mangle(s):
     return ''.join(chr(ord(c) + 1) for c in s)
 def unmangle(s):
     return ''.join(chr(ord(c) - 1) for c in s)
 
 def greet(repo, proto, name):
     return mangle(repo.greet(unmangle(name)))
 
 wireproto.commands['greet'] = (greet, 'name',)
 
 srv = serverrepo()
 clt = clientpeer(srv)
 
 print clt.greet("Foobar")
 b = clt.batch()
 fs = [b.greet(s) for s in ["Fo, =;o", "Bar"]]
 b.submit()
 print [f.value for f in fs]