test-pager: make the test compatible with chg D911 tried to make this test compatible with chg but instead resulted in the test being flaky for chg. For now, disabling this test for chg because it seems difficult to fix the test. This will allow for the continuous build setup for chg. Test Plan: Ran the test 'test-pager.t' with and without the '--chg' option. Differential Revision: https://phab.mercurial-scm.org/D1128