test-dispatch: stabilize the test When cwd is removed and `hg` is executed, some shells may run `getcwd` before forking and executing, some may not do it, some may print a different error message. The test should be shell-independent so let's just avoid checking the error message. Differential Revision: https://phab.mercurial-scm.org/D1282

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#

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# Avoid interference from actual test env:

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unset HGTEST_JOBS

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unset HGTEST_TIMEOUT

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unset HGTEST_PORT

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unset HGTEST_SHELL