The s_evergreen script fails when run as an external contributor on a forked repo.

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s_evergreen: test/evergreen/evg_cfg.py check
ERROR [test/evergreen/evg_cfg.py]: need to run this script inside a wiredtiger repo
	`git config remote.origin.url` returned "git@github.com:Key-Puncher/wiredtiger.git"
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This is due to git config remote.origin.url looking for the WiredTiger root folder. We may be able to resolve it by removing the 'wiredtiger/wiredtiger' check and using relative paths to navigate up to the WT root level folder. Alternatively, remove this check altogether since `os.chdir(run('git rev-parse --show-toplevel'))` should already be navigating to the top level wiredtiger directory. 

Related to WT-11745