tests: switch test from '--config ui.editor=~/foo' to HGEDITOR=~/foo
The test is currently not testing anything, the '--config ui.editor=~/path'
argument is apparently of lower priority than the HGEDITOR that run-tests.py is
setting.
Differential Revision: https://phab.mercurial-scm.org/D1809
To run the tests, do:
cd tests/
python run-tests.py
See https://mercurial-scm.org/wiki/WritingTests for
more information on writing tests.