dataclasses: unneeded test in _is_classvar

[ericvsmith]

BPO	33534
Nosy	@ericvsmith, @ned-deily, @miss-islington
PRs	bpo-33534: Remove unneeded test. #6897 [3.7] bpo-33534: Remove unneeded test. (GH-6897) #6899

^{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/ericvsmith'
closed_at = <Date 2018-05-16.11:56:09.079>
created_at = <Date 2018-05-16.08:04:01.287>
labels = ['3.7', '3.8', 'type-bug', 'library']
title = 'dataclasses: unneeded test in _is_classvar'
updated_at = <Date 2018-05-16.11:56:09.078>
user = 'https://github.com/ericvsmith'

bugs.python.org fields:

activity = <Date 2018-05-16.11:56:09.078>
actor = 'eric.smith'
assignee = 'eric.smith'
closed = True
closed_date = <Date 2018-05-16.11:56:09.079>
closer = 'eric.smith'
components = ['Library (Lib)']
creation = <Date 2018-05-16.08:04:01.287>
creator = 'eric.smith'
dependencies = []
files = []
hgrepos = []
issue_num = 33534
keywords = ['patch']
message_count = 3.0
messages = ['316779', '316797', '316800']
nosy_count = 3.0
nosy_names = ['eric.smith', 'ned.deily', 'miss-islington']
pr_nums = ['6897', '6899']
priority = None
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue33534'
versions = ['Python 3.7', 'Python 3.8']

[ericvsmith]

There's an unnecessary test for "if typing" in _is_classvar. I added this function yesterday, and due to some refactoring it picked up some superfluous text. I'm going to remove it.

[ericvsmith]

New changeset 9285835 by Eric V. Smith in branch 'master':
bpo-33534: Remove unneeded test. (GH-6897)
9285835

[miss-islington]

New changeset 8e20fc3 by Miss Islington (bot) in branch '3.7':
bpo-33534: Remove unneeded test. (GH-6897)
8e20fc3