Use terminal width by default in pprint

GitHub fields:

assignee = None
closed_at = <Date 2021-03-20.08:38:43.627>
created_at = <Date 2017-04-05.16:29:16.812>
labels = ['3.8', 'type-feature', 'library', '3.9', '3.10']
title = 'Use terminal width by default in pprint'
updated_at = <Date 2021-03-20.08:38:43.626>
user = 'https://github.com/serhiy-storchaka'

bugs.python.org fields:

activity = <Date 2021-03-20.08:38:43.626>
actor = 'serhiy.storchaka'
assignee = 'none'
closed = True
closed_date = <Date 2021-03-20.08:38:43.627>
closer = 'serhiy.storchaka'
components = ['Library (Lib)']
creation = <Date 2017-04-05.16:29:16.812>
creator = 'serhiy.storchaka'
dependencies = []
files = []
hgrepos = []
issue_num = 29996
keywords = []
message_count = 12.0
messages = ['291187', '291195', '291196', '291197', '291238', '291239', '291240', '291243', '291244', '291248', '301157', '389149']
nosy_count = 7.0
nosy_names = ['fdrake', 'rhettinger', 'eric.araujo', 'serhiy.storchaka', 'eryksun', 'josh.r', 'xiang.zhang']
pr_nums = ['1008']
priority = 'normal'
resolution = 'rejected'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue29996'
versions = ['Python 3.8', 'Python 3.9', 'Python 3.10']