hgweb: use ui.nontty to disable all cooked I/O

mercurial/hgweb/hgweb_mod.py

@@ -36,7 +36,7 b' class hgweb(object):'
             self.repo = repo
 
         self.repo.ui.setconfig('ui', 'report_untrusted', 'off')
-        self.repo.ui.setconfig('ui', 'interactive', 'off')
+        self.repo.ui.setconfig('ui', 'nontty', 'true')
         hook.redirect(True)
         self.mtime = -1
         self.size = -1

mercurial/hgweb/hgwebdir_mod.py

@@ -97,7 +97,7 b' class hgwebdir(object):'
         else:
             u = ui.ui()
             u.setconfig('ui', 'report_untrusted', 'off')
-            u.setconfig('ui', 'interactive', 'off')
+            u.setconfig('ui', 'nontty', 'true')
 
         if not isinstance(self.conf, (dict, list, tuple)):
             map = {'paths': 'hgweb-paths'}