hgweb: simplify uenv assignment

We don't need the Python 3 conditional. We can call items() directly
since we're on Python 3 now.

Differential Revision: https://phab.mercurial-scm.org/D12307

mercurial/hgweb/hgwebdir_mod.py

@@ -460,11 +460,8 b' class hgwebdir(object):'
                 if real:
                     # Re-parse the WSGI environment to take into account our
                     # repository path component.
-                    uenv = req.rawenv
-                    if pycompat.ispy3:
                         uenv = {
-                            k.decode('latin1'): v
-                            for k, v in pycompat.iteritems(uenv)
+                        k.decode('latin1'): v for k, v in req.rawenv.items()
                         }
                     req = requestmod.parserequestfromenv(
                         uenv,