remove unused vars in Lib/turtledemo module

[srinivasreddy]

BPO	35039
Nosy	@vstinner, @srinivasreddy
PRs	bpo-35039: remove unused clock() objects #10033 bpo-35039: remove unused clock() objects add pep8 corrections #10044

^{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 2018-10-24.22:45:27.202>
created_at = <Date 2018-10-21.20:52:39.094>
labels = ['3.8', 'library']
title = 'remove unused vars in  Lib/turtledemo module'
updated_at = <Date 2018-10-24.22:45:45.779>
user = 'https://github.com/srinivasreddy'

bugs.python.org fields:

activity = <Date 2018-10-24.22:45:45.779>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2018-10-24.22:45:27.202>
closer = 'vstinner'
components = ['Library (Lib)']
creation = <Date 2018-10-21.20:52:39.094>
creator = 'thatiparthy'
dependencies = []
files = []
hgrepos = []
issue_num = 35039
keywords = ['patch']
message_count = 2.0
messages = ['328250', '328397']
nosy_count = 2.0
nosy_names = ['vstinner', 'thatiparthy']
pr_nums = ['10033', '10044']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue35039'
versions = ['Python 3.8']

[srinivasreddy]

This PR removes the variables which are no longer used.

[vstinner]

Thanks శ్రీనివాస్ రెడ్డి తాటిపర్తి for your fix ;-)