patches/Restricted: no need to patch sorted on py3

In current versions, sorted is allowed in RestrictedPython.

Also, our implementation of sorted was not correct with generators,
it consumed the generator by iterating on it a first time to check the
values.

product/ERP5Type/patches/Restricted.py

@@ -177,8 +177,9 @@ import past.builtins # six.PY2
 allow_module('past.builtins')
 ModuleSecurityInfo('past.builtins').declarePublic('cmp')
 
-def guarded_sorted(seq, cmp=None, key=None, reverse=False):
-    if cmp is not None: # six.PY2
+if six.PY2:
+    def guarded_sorted(seq, cmp=None, key=None, reverse=False):
+        if cmp is not None:
             from functools import cmp_to_key
             key = cmp_to_key(cmp)
 
@@ -186,7 +187,11 @@ def guarded_sorted(seq, cmp=None, key=None, reverse=False):
             for i, x in enumerate(seq):
                 guard(seq, x, i)
         return sorted(seq, key=key, reverse=reverse)
-safe_builtins['sorted'] = guarded_sorted
+    safe_builtins['sorted'] = guarded_sorted
+
+def guarded_enumerate(seq, start=0):
+    return NullIter(enumerate(guarded_iter(seq), start=start))
+safe_builtins['enumerate'] = guarded_enumerate
 
 def guarded_reversed(seq):
     return SafeIter(reversed(seq))
@@ -195,9 +200,6 @@ ContainerAssertions[reversed] = 1
 # listreverseiterator is a special type, returned by list.__reversed__
 ContainerAssertions[type(reversed([]))] = 1
 
-def guarded_enumerate(seq, start=0):
-    return NullIter(enumerate(guarded_iter(seq), start=start))
-safe_builtins['enumerate'] = guarded_enumerate
 
 def get_set_pop(s, name):
     def guarded_pop():