Bug #1734723: Fix repr.Repr() so it doesn't ignore the maxtuple attribute.

Will backport
diff --git a/Lib/repr.py b/Lib/repr.py
index 53b5207..59015b1 100644
--- a/Lib/repr.py
+++ b/Lib/repr.py
@@ -52,7 +52,7 @@
         return '%s%s%s' % (left, s, right)
 
     def repr_tuple(self, x, level):
-        return self._repr_iterable(x, level, '(', ')', self.maxlist, ',')
+        return self._repr_iterable(x, level, '(', ')', self.maxtuple, ',')
 
     def repr_list(self, x, level):
         return self._repr_iterable(x, level, '[', ']', self.maxlist)