Fix pattern for HG changed files

[mjesun]

When running in master with Mercurial, it throws due to an empty revision set. This PR fixes it, see reply in #7880 (comment).

Tested locally with the use of hg log --rev, under bookmarks, branches and public commits.

[sunil1783]

Facing the same issue of hg test failed. I have clone jest from master branch.

To Reproduce :
git clone https://github.com/facebook/jest
cd jest
yarn install
yarn test

Result :
Summary of all failing tests
FAIL e2e/tests/jestChangedFiles.test.ts (17.225s)
â gets changed files for hg

Command failed: hg status -amnu --rev min((!public() & ::.)+.)^ /tmp/jest-changed-files-test-dir /tmp/jest-changed-files-test-dir/nested-dir /tmp/jest-changed-files-test-dir/nested-dir/second-nested-dir
abort: empty revision range

  at makeError (node_modules/execa/index.js:174:9)

FAIL e2e/tests/onlyChanged.test.ts (112.766s)
â gets changed files for hg

expect(received).toMatch(expected)

Expected pattern: /PASS __tests__(\/|\\)file2.test.js/
Received string:  "

  â Test suite failed to run

    abort: empty revision range

"

  299 |
  300 |   ({stdout, stderr} = runJest(DIR, ['-o', '--changedFilesWithAncestor']));
> 301 |   expect(stderr).toMatch(/PASS __tests__(\/|\\)file2.test.js/);
      |                  ^
  302 |   expect(stderr).toMatch(/PASS __tests__(\/|\\)file3.test.js/);
  303 | });
  304 |

[root@3e03e952ffa9 jest]# npx envinfo --preset jest

System:
OS: Linux 4.4 CentOS Linux 7 (Core)
CPU: (4) x64 Intel Xeon E312xx (Sandy Bridge)
Binaries:
Node: 8.15.1 - ~/.nvm/versions/node/v8.15.1/bin/node
Yarn: 1.15.0 - ~/.nvm/versions/node/v8.15.1/bin/yarn
npm: 6.4.1 - ~/.nvm/versions/node/v8.15.1/bin/npm

[root@3e03e952ffa9 jest]# hg --version
Mercurial Distributed SCM (version 2.6.2)
(see http://mercurial.selenic.com for more information)

Copyright (C) 2005-2012 Matt Mackall and others
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

[root@395776cf6f3f jest]# ./node_modules/.bin/jest -v
24.7.1-dev

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