A typing error in demo rpython.py

BPO	36690
Nosy	@gvanrossum, @berkerpeksag, @BriFuture
PRs	bpo-36690: Fix typing error in demo rpython.py #12903 [3.7] bpo-36690: Fix typo in Tools/demo/rpython.py (GH-12903) #12906

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2019-04-22.13:54:38.495>
created_at = <Date 2019-04-21.12:52:55.381>
labels = ['easy', '3.8', 'type-bug', '3.7']
title = 'A typing error in demo rpython.py'
updated_at = <Date 2019-04-22.13:54:38.494>
user = 'https://github.com/brifuture'

bugs.python.org fields:

activity = <Date 2019-04-22.13:54:38.494>
actor = 'berker.peksag'
assignee = 'none'
closed = True
closed_date = <Date 2019-04-22.13:54:38.495>
closer = 'berker.peksag'
components = ['Demos and Tools']
creation = <Date 2019-04-21.12:52:55.381>
creator = 'jiawei zhou'
dependencies = []
files = []
hgrepos = []
issue_num = 36690
keywords = ['patch', 'easy']
message_count = 5.0
messages = ['340606', '340609', '340651', '340653', '340654']
nosy_count = 4.0
nosy_names = ['gvanrossum', 'SilentGhost', 'berker.peksag', 'jiawei zhou']
pr_nums = ['12903', '12906']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue36690'
versions = ['Python 3.7', 'Python 3.8']