IDLE: Remove close_when_done from colorizer close()

BPO	36152
Nosy	@terryjreedy, @csabella, @miss-islington
PRs	bpo-36152: IDLE: Remove unused parameter from colorizer #12109 [3.7] bpo-36152: IDLE: Remove unused parameter from colorizer (GH-12109) #12119

^{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 = 'https://github.com/terryjreedy'
closed_at = <Date 2019-03-01.13:27:04.947>
created_at = <Date 2019-02-28.23:51:49.343>
labels = ['3.8', 'expert-IDLE', 'type-feature', '3.7']
title = 'IDLE: Remove close_when_done from colorizer close()'
updated_at = <Date 2019-03-01.14:52:47.862>
user = 'https://github.com/csabella'

bugs.python.org fields:

activity = <Date 2019-03-01.14:52:47.862>
actor = 'miss-islington'
assignee = 'terry.reedy'
closed = True
closed_date = <Date 2019-03-01.13:27:04.947>
closer = 'cheryl.sabella'
components = ['IDLE']
creation = <Date 2019-02-28.23:51:49.343>
creator = 'cheryl.sabella'
dependencies = []
files = []
hgrepos = []
issue_num = 36152
keywords = ['patch']
message_count = 4.0
messages = ['336880', '336884', '336913', '336920']
nosy_count = 3.0
nosy_names = ['terry.reedy', 'cheryl.sabella', 'miss-islington']
pr_nums = ['12109', '12119']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue36152'
versions = ['Python 3.7', 'Python 3.8']